Testing Solids

Solid materials are everywhere in our environment. They have many many different properties; colourless, shiny, soft, odourless etc. But we could also describe some liquids and gases using the same vocabulary.

So how do scientists 'test' materials to classify them as solids?

Bricks, trainers and keys are all solid, but so is sand, which appears to be very different!  Let's test it out.