Material Properties Vocabulary

Activities to try

1. 1

   The properties shelf: one word, many objects

   Why it works: A property word names a distinction that runs as a thread through many different objects, not a label stuck on one object; each word is defined by how a material behaves in a specific observable test; and electrical and thermal conductivity are two separate properties that must not be fused.

   1. Explore an illustrated shelf of a dozen everyday objects — glass jar, steel spoon, wooden block, rubber band, plastic ruler, bar magnet, sugar dissolving in a glass of water, sponge.
   2. Tap an object to reveal its stand-out property words, each paired with a small icon of the test that defines it and a spoken pronunciation of the word (e.g. transparent → you can see clearly through it; soluble → it dissolves, mixing into the liquid so you can no longer see the pieces, although it is still there; magnetic → a magnet pulls it).
   3. Use a property-word toggle: tap 'transparent' and watch every see-through object glow while the rest grey out; tap 'magnetic' and watch only the items a magnet pulls light up (the bar magnet and a steel spoon that has been checked to stick to a magnet; many stainless-steel spoons do not, so use an iron nail or paperclip instead if needed).
   4. Notice how the steel spoon lights under several different property threads (thermal conductor, rigid, opaque, and magnetic if it is a type a magnet pulls) — one object carries many properties at once.
   5. Open the conductor flap, which splits into two separate tests: an electrical test (does electricity pass through a circuit?) and a thermal test (does heat travel up the handle?), so electrical and thermal conductivity are named as two different properties.
2. 2

   Sort by the rule, then change the rule

   Why it works: Because a material carries many properties simultaneously, the group it belongs to depends on which property you sort by — the vocabulary is productive, not a fixed one-word tag per object.

   1. Drag each material under the correct property term, receiving immediate feedback on each placement.
   2. After sorting by one property (e.g. transparency), press a 'change the rule' control to re-sort the same materials by a different property (e.g. magnetism).
   3. Observe that one material lands in a different group depending on which property word is the sorting rule — e.g. an iron nail (or a steel spoon that a magnet pulls) groups with 'opaque' objects under one rule and with 'magnetic' objects under another.
   4. Say aloud why each material belongs where it does, using the property word and its test.
3. 3

   Describe it like a scientist: the saucepan and the frosted glass

   Why it works: Owning the vocabulary means deploying each term correctly in a rich context to JUSTIFY a material choice — keeping thermal vs electrical, transparent/translucent/opaque, and soluble/insoluble distinct — rather than reciting a single memorised definition.

   1. Handle (or view) a saucepan with a plastic handle and a piece of frosted glass.
   2. Describe them 'like a scientist choosing materials' — use as many proper property words as possible and say why each material was chosen for its part (e.g. the metal base is a thermal conductor so heat travels through it to the food; the plastic handle is a thermal insulator so heat travels through it slowly and it stays much cooler than the metal, though it can still get warm; the pan is rigid).
   3. Answer the probe: 'This frosted glass — is it transparent, translucent or opaque? Use the word in a sentence,' naming what it lets through that a brick wall does not.
   4. Answer follow-up probes that force confusable pairs apart: 'a conductor of WHAT?'; 'Is a heavy brick dense? Is a big bag of feathers dense? What is the difference between heavy and dense?'; 'Salt seems to vanish in water — is it soluble or insoluble? Say it in a sentence about making a drink.'