Heat Transfer in Nature Class 7 Notes

Heat Transfer in Nature Class 7 Notes

Heat Transfer in Nature Class 7 Notes

1. Heat transfer: The movement of thermal energy from a hotter object to a cooler one.
2. Fireplace: The part of a chimney that opens into a room and in which fuel is burned.
3. Equator: An imaginary line around the middle of a planet (like the Earth).
4. Sea breeze: The movement of cooler air from the sea to the land.
5. Land breeze: The movement of cooler air from the land towards the sea.
6. Precipitation: Rain, snow, sleet, or hail that falls on the ground.
7. Seepage: When liquid or gas slowly leaks through tiny holes or gaps in a container or barrier.
8. Scarcity: A very small supply.
9. Conduction: Heat transfer through direct contact (e.g., metal utensils).
10. Convection: Heat transfer through fluids (liquids and gases) due to the movement of the fluid itself (e.g., rising smoke).
11. Radiation: Transfer of heat through electromagnetic waves (e.g., heat from the Sun).
12. Infiltration: The process of water seeping into the ground.
13. Aquifers: Underground layers that store groundwater.
14. Sustainability: Ability to maintain or support a process over time (groundwater recharge and rainwater harvesting).

Methods of Heat Transfer:

1. Conduction
2. Convection
3. Radiation

The Sun as a Heat Source

1. The primary source of heat for Earth.

Effects of Solar Heat:

1. Evaporation of water from oceans, rivers, and lakes.
2. Melting of snow and ice during warmer months.

Water cycle Stages:

1. Evaporation
2. Transpiration
3. Condensation
4. Precipitation

Importance:

1. Redistributes and replenishes water in ecosystems.
2. Insulation and Heat retention
3. Reduce heat loss, keeping environments warm in cold climates.

States of Water

1. Solid: Ice, snow, glaciers.
2. Liquid: Water in oceans, rivers, lakes.
3. Gas: Water vapour in the atmosphere.

Groundwater and Infiltration

1. Infiltration
2. Aquifers
3. Sustainability