Techno science club

13th Oct 2019

technoscienceclub

Global warming

Global warming
To know
1. What is globe warming?
2. what are the effects of globe warming on humans and nature.
3. Background,Methodology,
please read full details
Background

Carbon di oxide(co2), Nitrogen dioxide, Chloro fluoro carbons, Hydro carbons, Methane are called Earth heating gases (Greenhouse gasses). Greenhouse gases trap radiation and prevent heat from leaving the earth’s surface. In this process they help to maintain the temperature of the earth. Excess presence of these gases in the atmosphere causes, excess global warming

Methodology
1. Take two identical glasses of the same material. Put equal quantity of water in them (half filled).
2. Note the temperature of water of both the glasses using a thermometer.
3. Place both the glasses out in open space so that sunlight directly falls on them.
4. Invert a glass bowl or a jar over one glass such that it is covered completely.

5. Atleast after two hours, note the temperature of water in both the glasses.
6. Note the difference in temperature of the two samples. Note which one is hotter.
7. Repeat the experiment with equal amount of ice in the two glasses instead of water. Note the time taken by ice to melt completely.
8. Try to find out the reasons for difference in the temperature of water and the time taken for melting of ice.
Conclusion
Factories, chemical industries are primary responsible factors for global warming. Different human activities are also responsible for it.
The Chloro Fluoro carbons which are used in air conditionars, refrigerators are released into the atmosphere. Burning of house hold wastes, plastic materials are also responsible for global warming. The reduction of green house gases like CO2 , CO is in our hands. For example reducing use of incandescent bulbs. Usage of refrigerators for limited period when actually it is required; instead of burning house hold wastes, they can be converted into manure by using earth worms (very compost). By thinking in these lines we can reduce global warming. This is our responsibility.
Relate your observations on global warming.
Follow-up
1. Observe the temperature of the interior of two similar cars parked in the sun, one with its window glasses completely rolled up and the other with window glasses rolled down. Take the temperatures again after two hours.
2. Collect news items relating to global warming and its impact appearing in newspapers and magazines.
3. What are the harmful effects of global warming? What activities you are going to follow to reduce these effects at your school, house, village level?