Ideas about materials

Density.

This is to do with how heavy a material feels. You must always compare the same volume of materials to have an idea of their density.

Which is heavier 1Kg of lead or 1Kg of feathers?

Answer . They are both the same. There would just have to be a much larger volume of feathers. Lead is more dense.

Compessibility

This is all to do with squeezing or squashing. Which is easier to compress, a solid (metal rod), liquid (water) or a gas (air in a balloon)?

Ease of Flow

Knock over a cup of water. What flows over the edge of the table?

Keeping Shape

A metal cube, an ice cube, a melted ice cube. Which keeps their shape the best? What about a cube of gas?

Another thing you can think about is how well they can keep their volume. Are they easy to keep in the same place? Does 10 centimetres cubed of water in a test tube remain 10 centimetres cubed of water if it is poured into a beaker (without spilling any)?