Final answer:
Temperature scales, triple point, and thermal expansion.
Step-by-step explanation:
1. Temperature Scales:
The three main temperature scales are Celsius, Fahrenheit, and Kelvin. Temperatures can be converted from one scale to another using temperature conversion equations.
2. Triple Point:
The three phases of water (ice, liquid water, and water vapor) can coexist at a single pressure and temperature known as the triple point.
3. Thermal Expansion:
Temperature affects the size of objects through thermal expansion. When heated, most substances expand, and when cooled, they contract. This is known as thermal expansion.