It is tempting to think that some materials are always heavier than other materials. For example, someone might say that metal is heavier than air. But it depends on how much of each material there is ...

What is the purpose of prescribed practical P4? To investigate experimentally the relationship between the mass and volume of liquids and regular solids, and analyse and interpret the data gathered.

A planet’s mass and volume are easy to determine. Because planets are nearly spheres, we can calculate volume from our knowledge of a planet’s radius, which we determine by measuring both the planet’s ...