What is Global warming? Which problems are considered as global environmental
problems? How can we save the earth from Gabal warming ? (2-3 pages) (5 marks)
Answers
Explanation:
BASIS FOR COMPARISON CONDUCTION CONVECTION RADIATION
Meaning Conduction is a process in which transfer of heat takes place between objects by direct contact. Convection refers to the form of heat transfer in which energy transition occurs within the fluid. Radition alludes to the mechanism in which heat is transmitted without any physical contact between objects.
Represent How heat travels between objects in direct contact. How heat passes through fluids. How heat flows through empty spaces.
Cause Due to temperature difference. Due to density difference. Occurs from all objects, at temperature greater than 0 K.
Occurence Occurs in solids, through molecular collisions. Occurs in fluids, by actual flow of matter. Occurs at a distance and does not heats the intervening substance.
Transfer of heat Uses heated solid substance. Uses intermediate substance. Uses electromagnetic waves.
Speed Slow Slow Fast
Law of reflection and refraction Does not follow Does not follow
Answer:
Global warming is the unusually rapid increase in Earth's average surface temperature over the past century primarily due to the greenhouse gases released as people burn fossil fuels.
The major environmental problems are pollution, global warming, ozone layer depletion, acid rain, natural resource depletion, overpopulation, waste disposal, deforestation and loss of biodiversity.
Avoid washing clothes in hot water. Just wash them in cold or warm water. Avoid taking frequent showers and use less hot water. It will help in saving the energy required to produce that energy.