Heat
ICSE · Class 7 · Physics
Summary of Heat for ICSE Class 7 Physics. Key concepts, important points, and chapter overview.
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Heat is a form of energy that flows from a hot body to a cold body when they are kept in contact. Temperature tells the degree of hotness or coldness of a body. Heat can change temperature, size, and state of matter. Heat moves by conduction, convection, and radiation, and these ideas explain many d
Key Concepts
Heat is a form of energy
Heat is a form of energy that flows from a hot body to a cold body when they are kept in contact. This flow continues until both bodies reach the same
Temperature tells the degree of hotness
Temperature tells the degree of hotness or coldness of a body. It is measured using a thermometer.
The SI unit of heat
The SI unit of heat is joule. Other units are calorie and kilocalorie. One calorie is the heat needed to raise the temperature of 1 g of water by 1°C,
Three temperature scales are used
Three temperature scales are used: Celsius, Fahrenheit, and Kelvin. The ice point and steam point are fixed points on each scale. The Kelvin scale has
A mercury thermometer works on
A mercury thermometer works on the thermal expansion of liquids. Its bulb contains mercury, and the stem has markings from -10°C to 110°C with 120 equ
Learning Objectives
- Define heat as energy and distinguish it from temperature
- State the units of heat and temperature
- Use the Celsius, Fahrenheit, and Kelvin scales
- Understand how heat changes temperature, size, and state
- Explain melting, freezing, boiling, evaporation, condensation, sublimation, and deposition
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