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## Physics / Heat and Energy

### Physics / Heat and Energy

You wrap up in blankets in the winter, hold your hands out to feel the warmth of a fire, and jump due to accidental touch of hot object. What is this thing which you call as heat?
You all know that heat is form of energy but how is this energy generated? Each substance is made up of molecules. The molecules in a substance are in a state of random motion. This kinetic energy due to random motion of the molecules of a substance is known as its heat energy. Thus each body possesses heat energy in form of its internal kinetic energy. Greater the heat energy content, hotter will be the body.
Understand the concepts of heat capacity, specific heat capacity and their difference.
Heat is transferred from a body at a higher temperature to a body at lower temperature. The effects of heat on an object are

• Change in temperature of a body
• Change in shape of a body
• Change of state of matter

Conduction, convection, and radiation are the different methods of heat transfer.

• Conduction- process of heat transfer from hot end to cold end from particle to particle of medium without actual movement of particles.
• Convection- process of heat transfer by actual movement of the medium particles.
• Radiation- process of heat transfer in which heat directly passes from one body to other body without affecting the medium. There are invisible electromagnetic waves responsible for heat transfer by radiation.

Find out whether conduction, convection and radiation is possible through vacuum. Learn about green house effect and its consequences.

All gases show uniform behaviour under similar conditions of temperature and pressure irrespective of their chemical nature or color or odor. This forms the basis of the Gas Laws.
Boyle's Law states that the volume of a given mass of a dry gas is inversely proportional to its pressure at constant temperature.
Charle's Law states that the volume of a given mass of a dry gas is directly proportional to its absolute (Kelvin) temperature if the pressure is kept constant.
This module includes problems based on gas laws, graphical representation of gas laws and significance of gas laws.

Exercises
Topics
Exercises
Topics
• ### Thermometers - SmartTest

SmartTest on Thermometers

• Questions: 10

### Expansion of Solids, Liquids and Gases - SmartTest

SmartTest on Expansion of Solids, Liquids and Gases

• Questions: 10

### The gas laws - SmartTest

SmartTest on The gas laws

• Questions: 10

### Specific Heat and Specific Latent Heat Capacity - SmartTest

SmartTest on Specific Heat and Specific Latent Heat Capacity

• Questions: 10

### Transfer of Heat - SmartTest

SmartTest on Transfer of Heat

• Questions: 10
• Molecules
• Thermometers
• Expansion of Solids, Liquids and Gases
• The gas laws
• Specific heat capacity
• Specific latent heat
• Conduction and convection