ICSE Physics Class 7 Notes Chapter 5 Heat

→ Heat is a form of energy that leads to the sensations of hotness or coldness.

→ Temperature is the degree of hotness and coldness of a body.

→ Thermometer is used to measure temperature.

→ The S.I. unit of temperature is °C.

→ The most common liquid for a thermometer is mercury.

→ The main sources of heat are (0 Fire (ii) Sun (iii) Electricity.

→ Those substances which can easily catch fire are called inflammable substances.

→ Those substances which are fire resistant are called non-inflammable substances.

→ The fixed temperature at which freezing of liquid occurs is known as freezing point.

→ The temperature at which vapourisation occurs is known as the boiling point.

→ Substances through which heat is easily conducted are called good conductors e.g. silver, gold, copper etc.

→ Substances through which heat is not easily conducted are called Insultors.

→ Radiation is the process of transfer of heat from a hot body to a cold body without affecting the intermediate medium

ICSE Class 7 Physics Notes

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