jug
Enable an agent to recognise a jug, assess its suitability and condition for a proposed use, and decide how it may be filled, carried, poured from, cleaned or withdrawn from use.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
Researched by: Codex + Grok
Purpose and description
Enable an agent to recognise a jug, assess its suitability and condition for a proposed use, and decide how it may be filled, carried, poured from, cleaned or withdrawn from use.
A jug is a portable liquid vessel defined in material-culture, ceramics, and trade practice by a single handle set opposite a pouring lip or spout, used to hold, carry, and dispense liquids rather than to drink from the rim.
It can be Fill through a suitable opening up to a justified working level.; Lift and carry using a grip appropriate to the current mass and temperature.; Tilt to dispense into a receiving vessel with controlled flow.; Fit, open or remove a compatible lid or closure where provided.; Empty, clean, inspect and dry accessible contact surfaces.; Withdraw from a proposed use when damage, contamination or unsupported compatibility prevents a justified decision..
Distinguishing features
Assess whether its opening, lip or spout and grip arrangement support transferring contents by tilting; distinguish this use from a vessel primarily intended for direct drinking.
Compare its neck, closure and carrying arrangement with those of a bottle or carafe; record ambiguous cases rather than treating a handle or narrow neck as decisive.
Check for a directed pouring edge and controllable grip that distinguish it from a bucket primarily arranged for carrying and broad discharge.
Check whether it is a passive vessel or incorporates an active heating function that may place it within a kettle or appliance model.
Treat graduations as evidence of a measuring function, not as sufficient evidence that a vessel is a jug.
Scope
+ Vessel form and features supporting filling, containment, carrying and controlled pouring
+ Capacity, opening dimensions, mass and stability in relevant fill states
+ Body, handle, spout, lid and closure construction
+ Integrity, cleanliness and suitability for specified contents and temperatures
+ Current contents relationship, fill state and operational readiness
- Composition, quality and ownership of the liquid or other contents
- Recipes, beverage preparation and serving workflows
- Heating appliances and active heating systems
- Transport packaging and logistics systems surrounding the jug
- Manufacturing processes and material properties beyond their implications for this jug
Characteristics
- Vessel subtype
- serving pitcher | storage jug | measuring jug | other | unresolved Establishes which recognition tests and use constraints need investigation.
- Capacity
- mL or L, distinguishing nominal, brimful and usable capacity Determines whether a proposed quantity fits with sufficient headspace for carrying and pouring.
- Empty and current mass
- g or kg, with empty or filled state identified Supports lifting and grip decisions for the actual load.
- Filling and cleaning access
- opening dimensions and minimum internal access clearance in mm Determines whether filling equipment and cleaning tools can reach the interior.
- Pouring outlet
- formed lip | projecting spout | neck opening | other, with outlet dimensions Affects stream placement, flow control and dripping.
- Grip arrangement
- side handle | top handle | body grip | multiple grips | other Determines feasible lifting and tilting actions.
- Contact materials
- identified body, lining, glaze, seal and closure materials, or unknown Supports evidence-based compatibility and cleaning decisions.
- Supported use limits
- links to markings, instructions or test evidence for contents, temperature and cleaning limits Prevents appearance or material assumptions from being mistaken for verified suitability.
- Closure state
- not fitted | open | seated | secured | damaged | unverified Affects contamination exposure, filling, venting and spill risk.
- Integrity and cleanliness
- location-specific observations of cracks, chips, leaks, looseness, residues and odours Determines whether the jug is ready for the proposed use or needs intervention.
- Contents and fill state
- linked contents identity, estimated or measured quantity, temperature and observation time Connects the vessel's present load to compatibility, stability and handling decisions.
Also called
+2
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.jug
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 6 bundles · 11 layers · 18 findings · 28 questions.
Jug recognition Evidence that the vessel belongs to the jug entry and identification of its functional variant.
Jug overlaps with pitcher, bottle, carafe, bucket and kettle, so identification must expose boundary evidence.
Containment and pouring form
The physical arrangement that enables holding and transferring contents.
Jug form evidence
Record the body, opening, pouring edge and grip arrangement without assuming every jug has a separate spout or handle.
- Which observed features support identifying this vessel as a jug? definition
- What distinguishes it from a bottle, carafe, cup or bucket in this case? boundary
Variant and designated use
The jug's stated role and any functions that introduce neighbouring model boundaries.
Intended jug role
Record evidence for serving, storing or measuring use and identify any integrated heating or treatment function.
- Which markings, instructions or other evidence identify the jug's intended use? provenance
- Does an integrated function require a related appliance or treatment model? boundary
Capacity and access How much the jug can contain and how its interior can be accessed.
Nominal volume alone does not establish a safe working fill, measurement accuracy or cleaning access.
Fill envelope
Capacity and headspace under the intended filling and handling conditions.
Usable fill level
Separate labelled capacity, measured brimful capacity and an appropriate working fill.
- What are the nominal and measured capacities, and how were they established? measurement
- What fill level leaves sufficient headspace for the proposed carrying and pouring action? action
Openings and graduations
Access for filling and cleaning, and any features used to estimate volume.
Interior access and reading
Record opening restrictions, inaccessible recesses and the evidence supporting any volume scale.
- What opening dimensions and internal restrictions govern filling and cleaning access? measurement
- If graduations exist, what evidence establishes their units, reading method and accuracy? provenance
Contents compatibility Whether this jug's contact surfaces and construction support the proposed contents and conditions.
A jug's appearance does not establish food-contact suitability, chemical compatibility or temperature limits.
Contact surface construction
Materials and finishes that contact contents or affect their containment.
Contact material evidence
Identify the body interior, coatings, seals and closure surfaces and retain uncertainty where identification is unsupported.
- Which materials and finishes contact the contents, including at the lid and outlet? definition
- What evidence supports their suitability for the proposed contents? provenance
Thermal and cleaning limits
Supported temperature, temperature-change and cleaning conditions.
Supported exposure
Record documented limits relevant to hot filling, chilling and cleaning without inferring them solely from material names.
- What evidence establishes temperature and temperature-change limits for the complete jug? provenance
- Which cleaning methods are supported for its body, handle, coatings and seals? action
Carrying and dispensing The jug's behaviour while standing, being lifted and being tilted to pour.
Fill level, grip geometry, base support and outlet behaviour jointly determine whether an agent can handle a jug successfully.
Grip and standing stability
Load support through the handle or body and the base in relevant fill states.
Supported handling
Record usable grip clearance, attachment condition, current mass and stability on the intended surface.
- What are the current mass, available grip clearances and base contact dimensions? measurement
- Can the intended handler lift, carry and set down this filled jug with a secure grip? action
Pour path and closure
How contents leave the jug and how lids, closures and air entry affect the stream.
Controlled discharge
Record stream placement, dripping, intermittent flow and lid retention for relevant fill levels.
- How does the stream behave at the intended fill level and pouring angle? measurement
- What opening, venting or lid-securing action is needed before pouring? action
Condition and readiness Whether the jug's present integrity, cleanliness and contents history permit the next use.
Cracked bodies, loose handles, damaged pouring edges and retained residues can defeat an otherwise suitable jug.
Containment and component integrity
Damage affecting liquid retention, load support and the pouring interface.
Jug defect assessment
Locate cracks, chips, leaks, deformation and loose attachments, and relate them to the proposed use.
- What defects are observed at the body, base, handle attachments, pouring edge and closure? measurement
- Do these observations require further inspection, restricted use or withdrawal? action
Residue and current load
Present contents, prior-use evidence and cleanliness of the interior and outlet.
Next-fill readiness
Record remaining contents, residues, odours and cleaning history without equating visible cleanliness with verified suitability.
- What is known about current or previous contents and the most recent cleaning? provenance
- What emptying, cleaning, drying or verification is needed before the intended next fill? action
Evidence and external alignment What the world already says about this thing, gathered so the model can be checked against it.
A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.
Reported evidence
Findings from the breadth pass, kept separate from the structural claims.
Kinds and varieties
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- table serving jug (open-mouthed ceramic, glass, or metal pitcher-form)
- cream or milk jug of a tea or coffee service (typically 100-300 ml)
- graduated kitchen measuring jug
- plastic storage jug (household milk, water, or detergent, often with a screw cap)
- pub or beer jug for serving ale
- character or Toby jug (figural collectible)
- stoneware spirit or moonshine jug with a narrow neck and stopper
- washstand or hot-water jug (bedroom/domestic washing set)
- Which of these kinds and varieties hold for the sense of jug this model covers, and on what evidence? provenance
Identifiers and schemes
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Wikidata - Q2417 - Item for the container class 'jug', sitelinked from Wikipedia 'Jug (container)'; not the slang or anatomical senses.
- Getty Art & Architecture Thesaurus - jugs (vessels) - Preferred AAT object type for the handled pouring vessel; confirm the numeric AAT ID against the live vocabulary.
- Harmonized System - 3923.30 - Plastic carboys, bottles, flasks and similar articles, the heading under which many commercial plastic jugs are entered.
- Harmonized System - 6912 - Ceramic tableware and kitchenware heading that includes ceramic serving jugs.
- Which of these identifiers and schemes hold for the sense of jug this model covers, and on what evidence? provenance
Standards and regulation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Regulation (EC) No 1935/2004 on materials and articles intended to come into contact with food - European Parliament and Council (food-contact ceramic, glass, and plastic jugs in the EU).
- Council Directive 84/500/EEC on ceramic articles intended to come into contact with foodstuffs - Council of the European Communities (lead and cadmium release limits for ceramic jugs).
- ISO 6486-1, Ceramic ware, glass-ceramic ware and glass dinnerware in contact with food - Release of lead and cadmium - International Organization for Standardization.
- 21 CFR 177.1520 Olefin polymers - U.S. Food and Drug Administration (HDPE and related resins used for milk and water jugs).
- Weights and Measures Act 1985 and associated measuring-container rules - United Kingdom (capacity marking and use of graduated measuring jugs in trade).
- Which of these standards and regulation hold for the sense of jug this model covers, and on what evidence? provenance
Real-world use
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Poured at table for water, milk, juice, gravy, or beer.
- Held and dispensed in kitchens as a measuring vessel for cooking and baking.
- Sold as a one-gallon (or similar) retail package for milk, juice, water, or household chemicals.
- Collected as Toby and character jugs; displayed rather than used.
- Used historically as a bedroom washstand pair with a basin, and as a stoneware container for spirits.
- Blown as a bass instrument in jug bands, using the vessel's cavity rather than its pouring function.
- Which of these real-world use hold for the sense of jug this model covers, and on what evidence? provenance
Typical measurements
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- nominal capacity - 0.1-5 for domestic table and kitchen forms; about 3.785 for a US gallon milk jug - L
- empty mass - 0.05-0.15 for thin HDPE household jugs; 0.3-2 for ceramic or stoneware - kg
- overall height - 80-400 for typical domestic jugs - mm
- graduation tolerance (measuring jugs) - about 1-5 of reading, depending on class and mark - %
- Which of these typical measurements hold for the sense of jug this model covers, and on what evidence? provenance
Failure modes and hazards
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- Handle snap or joint failure, especially at a ceramic handle join or a moulded plastic weld.
- Chip or crack at the pouring lip, ruining a clean pour.
- Thermal shock fracture when boiling liquid is poured into a cold ceramic or glass jug.
- Freeze-burst of a filled, tightly capped jug.
- Chemical migration from food-contact plastics, and lead or cadmium leaching from older or poorly formulated ceramic glazes.
- Bacterial biofilm in reusable water jugs that are not cleaned.
- Poisoning or contamination when a chemical jug is reused for drink.
- UV embrittlement and stress cracking of outdoor HDPE jugs.
- Which of these failure modes and hazards hold for the sense of jug this model covers, and on what evidence? provenance
Regional variation
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- In British, Irish, and much Commonwealth usage, 'jug' is the ordinary table-service name for what American English usually calls a pitcher.
- In American English, 'jug' more often names a large, often narrow-necked bottle with a small handle (milk jug, moonshine jug) rather than an open table pitcher.
- Toby and character jugs are a specifically English (especially Staffordshire) collecting tradition.
- Mediterranean and Near Eastern practice more often names a related spouted washing or serving form an ewer rather than a jug.
- Which of these regional variation hold for the sense of jug this model covers, and on what evidence? provenance
Neighbouring kinds and how to tell them apart
Reported by the breadth pass; each item needs checking against its source before it becomes normative.
- pitcher - Same or closely allied table-service form; separated mainly by dialect (US 'pitcher' vs UK 'jug'), though US retail 'pitcher' is typically wide-mouthed and US 'jug' often narrow-necked with a cap.
- ewer - Has a distinct tubular spout and is primarily a washing or ceremonial pouring vessel, not a pulled-lip table or storage jug.
- bottle - Narrow-necked, usually without a pouring handle or lip; liquid leaves through the neck rather than a formed pouring edge.
- carafe - Handleless table vessel for wine or water; the absence of a handle is the usual working test.
- jar - Wide-mouthed storage vessel whose orifice is for filling and scooping, not for directed pouring.
- flagon - Typically larger and often lidded, used for ale, cider, or ecclesiastical wine rather than open table pouring.
- mug - A drinking vessel whose rim is for the mouth; a jug is designed to pour, not to be drunk from.
- Which of these neighbouring kinds and how to tell them apart hold for the sense of jug this model covers, and on what evidence? provenance
Sources
- Jug (container) - Core vessel sense, overlap with pitcher, and the main domestic and collectible varieties (including Toby and puzzle jugs).
- jug, n.1 - Historical English senses of the pouring vessel and the British table-service usage that American English often names a pitcher.
- jugs (vessels) - Museum object-type definition separating jugs from bottles, jars, ewers, and other vessel classes in the Art & Architecture Thesaurus.
- 21 CFR 177.1520 Olefin polymers - Food-contact polymer rules that govern common HDPE household milk and water jugs in the United States.
What the second pass must settle
- Does the registry intend jug to include both serving pitchers and narrow-neck storage jugs, and where are its boundaries with bottle and carafe?
- Should measuring, filtering, insulated or electrically heated jugs use this model with linked functional models, or belong to separate registered entries?
- Which authoritative evidence and assessment methods should establish contents compatibility and thermal limits for each construction type?
- Which repeatable methods should establish usable capacity, standing stability and pouring performance across relevant fill states?
- What defect and cleaning criteria should determine readiness for different intended uses, especially when previous contents are unknown?