Terminology

2. The mass of a substance divided by its volume, indicating how compact the particles are.
3. A minute portion of matter, which can be an atom or molecule in gases.
4. The amount of space occupied by a substance, usually measured in liters or cubic meters.
5. The general rules that describe the behavior of gases under various conditions of temperature and pressure.
7. The energy of motion; in gases, it relates to the speed of particles.
9. The process by which gas particles escape through a small opening into a vacuum.
11. The ability of a gas to decrease in volume under pressure.
12. The increase in volume of a gas when heated, as particles move faster and spread apart.
13. The force exerted by gas particles per unit area on the walls of its container.
14. A physical system that does not allow matter to enter or leave, only energy exchange is allowed.

1. A measure of the average kinetic energy of particles in a substance.
6. The process by which gas particles spread out to evenly fill their container.
8. A state where opposing forces or influences are balanced, such as pressure and temperature in a gas.
10. A state of matter that has no fixed shape or volume, expanding to fill its container.
11. An event where gas particles hit each other or the walls of their container, affecting pressure.