Heat

1. Sources of heat

1.1. Natural Sources

1.1.1. Hot geyser

1.1.2. Sun

1.1.3. Hot Spring

1.2. Unnatural Sources

1.2.1. Candle Flame

1.2.2. Burning Coal

1.2.3. Matches

1.2.4. Burning Wood

1.2.5. Electric oven

2. Thermometers

2.1. Clinical thermometer

2.2. Laboratory thermometer

3. Temperature

3.1. Degree Celsius

3.2. Human body temperature is 37 degrees celsius

4. Sense of Touch

4.1. Feel if something is hot or cold

5. Heat sensors or dataloggers

6. Heat Gain

6.1. Something that gains heat will becoming hotter

7. Heat Loss

7.1. Something that loses heat will becoming cooler

8. Heat always flows from a hotter to a colder place or object