Matter

2. The temperature at which a liquid turns into a gas.
5. The forces that pull particles together, keeping them close to each other.
9. The process of a substance becoming larger or more spread out when it is heated.
12. The process of adding heat to a substance, which can cause it to change state or temperature.
15. How much mass is packed into a given volume of a substance. It tells you how "heavy" something is for its size.
18. The different forms matter can take—solid, liquid, or gas.
19. Anything that has mass and takes up space.
20. A state of matter where particles are tightly packed together and only vibrate in place, maintaining a fixed shape.
21. The process of matter changing from one state (solid, liquid, gas) to another, like melting or freezing.
22. The temperature at which a solid turns into a liquid.

1. The process of a substance becoming smaller or more compact when it cools.
3. The temperature at which a liquid turns into a solid.
4. A measure of how hot or cold something is, often measured in Celsius or Fahrenheit.
6. A state of matter where particles are far apart and move freely, filling the space they occupy.
7. The process of losing heat, causing a substance to become colder.
8. A state of matter where particles are close together but can still move around, taking the shape of their container.
10. A tool used to measure temperature.
11. The amount of matter in an object, typically measured in grams or kilograms.
13. The basic physical systems and structures needed for a society or community, often related to energy, transportation, and communication.
14. A scale used to measure temperature, where water freezes at 0°C and boils at 100°C.
16. The amount of space an object or substance occupies.
17. A tiny piece of matter, such as an atom or molecule.
19. A way to describe matter by thinking of it as being made up of tiny particles that are always moving.