Important Terms:
1. Temperature is the measure of the degree of hotness or coldness of an object.
2. Thermometer is the device used to measure temperature.
3. Celsius is the unit in which temperature is measured.
4. Clinical thermometer is the device used to measure our body temperature.
5. Laboratory thermometer is the device used to measure temperature of objects other than the human body.
6. Heat is a form of energy that is transferred from one object to another due to a difference in temperature.
7. Maximum-minimum thermometer is used to measure highest & lowest temperatures of the day.
8. Conductors are the materials which allow heat to pass through them easily.
9. Insulators are the materials which don't allow heat to pass through them easily.
10. Conduction is process of heat transfer in solids where heat flows from hot to cold part through direct contact.
11. Convection is process of heat transfer in liquids & gases.
12. Radiation is a process of heat transfer without any medium.
13. Sea breeze is the cool air that blows from the sea towards the land during the day.
14. Land breeze is the cool air that blows from the land towards the sea at night.
Key Points:
1. Range of clinical thermometer is 35°C to 42°C.
2. Range of laboratory thermometer is –10°C to 110°C.
3. The normal body temperature is 37°C.
4. Heat flows from a hotter object to a colder object.
5. Mercury is a toxic substance & harmful to the environment.
6. Dark-coloured objects absorb more heat than the light-coloured objects.
