Vacuum - GCSE Physics Definition

A vacuum is a space that has no matter, which means there are no air particles or anything else in it. It's like a completely empty container. In a perfect vacuum, there is no air pressure because there are no gas molecules moving around. A vacuum is important in physics because it helps us study how objects behave without air resistance affecting them. For example, in a vacuum, a feather and a stone would fall at the same rate, whereas normally air would slow the feather down. Outer space is almost a perfect vacuum, but they can also be created for scientific experiments.