Heat Transfer:
The movement of heat from a hotter object to a colder object is called heat transfer.
Conduction:
Conduction is a process in which heat is transferred from the hotter part to the colder part of a solid directly without involving any actual movement of the particles of the solid body.
Good Conductors:
Materials that allow heat to pass through them are called good conductors of heat.
Example:
Steel, iron, aluminium, brass, copper
Bad conductors:
Materials that do not allow heat to pass through them are called bad conductors or insulators of heat.
Example:
Wood, glass, clay, porcelain, plastic, air
Convection:
Convection is the process where heat is transferred from one place to another through gas and liquid due to the actual movement of particles, as hot air moves upward and cool air downward.
Sea breeze:
During the daytime on the beach, the soil heats up faster than the sea water, and the air above the land becomes hot. As hot air is lighter it rises up. This in turn causes the cooler air from above the sea to move towards the land. This movement of cooler air from the sea to the land is called sea breeze. The sea breeze is more prevalent during the spring and summer seasons.
Land breeze:
At night on the beach there is no sunlight, so the soil cools down faster than the sea water, and the air above the sea becomes hot. The hot air above the sea rises up as it is lighter. Cooler air from the land moves towards the sea. This movement of cooler air from the land to the sea is called land breeze. Land breeze is more prevalent during the autumn and winter seasons.
Radiation:
Radiation is the transfer of heat energy through invisible waves called electromagnetic waves. It doesnot need any medium like solid, liquid or gas. It can even transfer through empty spaces.
A hot summer:
During summer, the heat from the sun is intense, making us feel hotter. During this time, wearing light-coloured clothes, such as white, helps us stay comfortable.
This is because light-coloured clothes reflect most of the sun’s radiation, keeping our bodies cooler. In contrast, dark-coloured clothes absorb more of the sun’s heat, making us feel warmer and more uncomfortable.
A cold winter:
During the winter season, the Earth receives less heat from the sun, which is why we feel colder. Wearing dark-coloured clothes, such as black, helps us stay warmer during this time.
This is because dark colours absorb more heat, and when an object absorbs heat, its temperature increases, making us feel more comfortable in the cold.
Additionally, we often wear woollen clothes in winter because wool is a poor conductor of heat. It prevents the cold from outside from reaching our body, helping to retain body warmth. That’s why woollen clothes keep us more comfortable during cold weather conditions.