# Science Reading on Density – Questions

1. Define “density’.

Density is the degree of how close the particles of a material is. For example, if the particles of water vapour in a cloud are tightly compressed together, then that cloud would be more dense then a cloud that has particles scattered all about.

2. Are gases more or less dense that liquids or solids at room temperature?

Gases are less dense then solids and liquids. I think this because ‘solid’ means something that is sturdy without holes or anything. That means if solids don’t have any holes unless it’s swiss cheese, then there shouldn’t be any air in there. If there is air in a solid, then that solid is considered less dense, like cake or aluminium. But if there isn’t any air in the solid, then it would be classified as a dense solid, like mercury or gold. Liquids are more dense then gases because the liquid’s particles are more connected then gas because gas is more ‘airy’ then liquid.

3. How does temperature affect the density of a material?

When the temperature in an area increases, the volume of the material increases. And because in order to find density, you need volume and mass, so if the volume increases, then the density decreases.

4. A certain liquid sample has a volume of 14.7 mL and a mass of 22.8 grams. Calculate the density.

22.8 (M) ÷ 14.7 (V) = 1.55    →  Density = 1.55 mL/g

5. A material with a density of 2.7 grams/mL occupies 35.6 mL. How many grams of the material are there?

2.7 (D) × 35.6 (V) = 96.12   →  Mass = 96.12 grams

6. A certain material has a density of 19.3 g/mL. What is the material?

Gold.