They could stop bumping into each other. Simon beamed. Yay! He'd regain his personal space bubble again. Then he listened to Airey speak about Charles and Boyle's Law. Ooh! Those names sounded very familiar. He remembered his older brother had been trying to explain their properties to him a while ago. Pulling out a mini notebook from his trousers' right pocket, he jotted down some notes about the two laws.

With the two laws in mind, he focused on Boyle's law. When the temperature of an ideal gas is fixed, pressure and volume were inversely proportional.

Simon shouted more excitedly this time as he tried to match his mate's, Grayson's volume. "According to Boyle's Law, pressure and volume are inversely proportional when temperature is fixed. So basically if volume increases, then pressure must decrease. The reverse is true. If volume decreases, pressure increases."

He was pretty sure that was it.