Thermal properties of matter

8. The state in which two bodies in physical contact with each other have identical temperatures.
9. The heat required for a substance to undergo a phase change without changing temperature.
12. Radiation generated by the thermal motion of charged particles in matter.
13. The amount of heat per unit mass required to raise the temperature by one degree Celsius.
14. A transition of matter from one state (solid, liquid, gas) to another.
16. The expansion of a material's surface area due to heat.
17. Describes the rate of heat loss of a body is proportional to the difference in temperatures between the body and its surroundings.
18. The lowest possible temperature where nothing could be colder and no heat energy remains in a substance.
20. The branch of physics concerned with heat and temperature and their relation to energy and work.
23. The quantity of heat required to change a system's temperature by one degree.
24. The ratio of the change in length, area, or volume of an object to its temperature change.
25. The increase in volume of substances in response to a temperature increase.
26. The transfer of heat from a high temperature region to a lower temperature region.
27. The property of a material that determines the rate at which it changes temperature.
28. The tendency of matter to change in volume in response to a change in temperature.
29. The rate of temperature change in a material with respect to distance.

1. Expansion of an object in only one dimension as a result of temperature increase.
2. Stress in a material due to temperature-induced expansion or contraction differences.
3. The physical properties of materials that affect their ability to conduct heat, including thermal conductivity and specific heat.
4. Heat transfer in fluids where warmer parts of the fluid rise and cooler parts sink.
5. A system that converts heat or thermal energy to mechanical work.
6. The movement of thermal energy from one object to another of different temperature.
7. The direct conversion of temperature differences to electric voltage and vice versa.
10. The heat added to or removed from a substance that results in a temperature change.
11. Heat transfer through a solid material from high to low temperature areas.
15. The rate at which heat passes through a material.
19. Heat transfer through electromagnetic radiation, such as infrared.
20. A material's ability to conduct heat.
21. A theoretical gas composed of many randomly moving point particles that interact only through elastic collisions.
22. Instruments used to measure the amount of heat involved in a chemical or physical process.