How do particles of gas create pressure

Gas pressure is caused when the gas particles hit the walls of their container. The more often the particles hit the walls, and the faster they are moving when they do this, the higher the pressure. This is why the pressure in a tyre or balloon goes up when more air is pumped in

Explanation:

-be a crystalline solid

- be soluble in water

-conduct electricity

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14 days is the half-life of phosphorus-32