A tumbler can be steel, plastic, or glass — the choice depends on the object's purpose.
Indian pottery-making goes back 7,000–8,000 years — clay shaped and baked into terracotta.
A shiny surface — usually metals, like iron, copper, zinc, aluminium, and gold.
No shine — paper, wood, rubber, jute. Not everything shiny is a metal, though — some things are just polished.
Difficult to compress or scratch — stone, iron.
Compresses or scratches easily — sponge, eraser. Hardness is relative: rubber beats sponge, but loses to iron.
See clearly through it — glass, water, air.
See through it, but not clearly — butter paper, frosted glass.
Nothing can be seen through it — wood, cardboard, metal.
Completely dissolves in water — sugar, salt. Even oxygen gas dissolves in water, vital for aquatic life.
Does not dissolve in water — sand, chalk powder, sawdust.
Tells whether an object is heavier or lighter. Commonly measured using a balance.
The amount of space an object occupies — shown by water level in identical tumblers.
Any substance used to create an object.
Grouping by a shared property.
Shiny / not shiny.
Hard to / easy to compress or scratch.
Clear to see through / not at all.
Partly, unclearly see-through.
Dissolves / does not dissolve in water.
Anything with mass that occupies space.