Thermoscope - Experiment to prove that black substances absorb heat faster - Science





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Published on Sep 10, 2012

Science Video for Grade 7-8 students that proves that black substance absorb and lose heat faster.


Take a glass flask; Fix a one holed rubber cork in the mouth of the flask. Insert a glass tube bent twice at right angles. Insert some colored water into the horizontal portion of the glass tube. Now apply some black soot on one half of the flask as shown. This apparatus is called the thermoscope. Place a burner near the thermoscope. The colored water moves indicating that air in the flask expands. Now put a cardboard in between the burner and the apparatus. The colored water remains steady. When the flask cools the colored water indicator moves backward. If a person goes out in the sun wearing black clothes, his body gets hot very quickly. However if he wears white clothes, his body takes a lot of time to get hot.

Here is an another experiment that proves this. Take two similar small tins. Apply a black coating to one of them and fill them with water.
Record the temperature of water in both the tins. Put these tins in the sun for a while and record the temperatures once again. The temperature in the black coated tin would be higher compared to the one in the normal tin. This activity clearly shows that black substances absorb heat faster. Now heat the two tins. When the temperatures of water in them are the same put them in a cold place. Wait for some time and note the temperatures. Observe that the black coated tin's water would be cooler than that of the other tin. This proves that black substances not only absorb heat faster but also lose heat faster.

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