Designed to reduce air resistance

The height of a wave

One or more results that don’t fit the pattern of other results

Single celled organism

When a vapour turns into a liquid, such as water vapour turning into water

Energy, such as heat, travelling through a solid object

Overloading of a system, making movement difficult

The using up of something, such as a fuel

Something that has contaminated another substance, causing it to become impure

Movement of a fluid, such as water or air, as a result of being heated