Find out about liquids and gases, atmospheric pressure and particle collisions with this guide to pressure in fluids for KS3 physics students aged 11-14 from BBC Bitesize.

Everyone is familiar with what happens when you shake up a bottle of soda and then open it up, or else hand it to an unsuspecting friend and let them open it up. If you don't, well it will explode ...

The four fundamental states of matter are solid, liquid, gas and plasma, but there others, such as Bose-Einstein condensates and time crystals, that are man-made.

Predicting liquid loading. Fig. 7 shows liquid loading in Well X3. In this example, the reported flow rate was less than the critical liquid-carrying flow rate at a well depth of more than 2,500 m.