In this experiment, we will determine what colour of jars has high emission and absorption capacity. And we will also be determining which colour of jar radiates more heat by performing heating and cooling of different coloured jars.
To determine which colour of jar radiates, emmit, and absorbs more heat.
1. The emission of heat waves from any material is termed Emissivity of heat.
2. The absorption of heatwaves by any surface is termed heat absorption.
3. The rate of emission of heatwaves by any surface is termed radiation.
1. Ten small jars,
2. Nine different colours (silver, blue, yellow, red, gold, black, white, green, and purple) of enamel paint,
3. Tap water,
4. Worklight that has 2 high-powered 500 volts lights.
6. A foil,
Step 1: Paint nine out of ten jars with silver, blue, yellow, red, gold, black, white, green, and purple colour enamel paint. The tenth jar will be used as a control variable.
Step 2: Let the jars dry for several minutes.
Step 3: Divide the coloured jar into three groups with three coloured jars in each group. The first group will include red, yellow, and blue colour jars. The second group will include Silver, gold, and black colour jars. The third group will include the purple, green, and white colours of jars.
Step 4: Fill each jar with 80 ml of tap water of temperature 24 degrees celsius.
Step 5: Use a work light for producing heat. The worklight must have two high-powered 500 volts lights.
Step 6: Test four jars (each group) at one time. Each time the fourth one will be the same jar and act as a control variable.
Step 7: Perform this experiment with every group.
Step 8: For each 500 volts light, there will be two jars. Both should be kept 20 cm away from the light and 3 cm away from one another.
Step 9: Put a calibrated glass thermometer inside each of the jars for measuring water temperature.
Step 10: Put a foil wall between two lights to avoid the effect of light on other jars.
Step 11: Check the temperature every ten minutes for the next hundred minutes.
Step 12: Record this temperature.
Step 13: Pour 59 degrees celsius water in each of the ten jars for performing a cooling trial.
Step 14: Check the temperature every ten minutes for the next hundred minutes.
Step 15: Record your observations.
1. We observed that the green coloured jar heated the fastest with a temperature of 63 degrees celsius.
2. Blue coloured jar obtained a temperature of 59 degrees celsius.
3. Next, comes the black coloured jar that obtained an average temperature of 52 degrees celsius.
4. And the temperature of gold was 41 degrees Celsius, the coolest of all.
5. The cooling rate of all the coloured jars were almost similar but the black coloured jar cooled more rapidly.
1. We obtained an image of the visible spectrum that showed blue and green had the thickest bonds.
2. And we think this is the reason why green and blue coloured jars had the highest emissivity and heated the fastest.
3. And the reason for the chlorophyll to be green is because the green colour has the highest emissivity.
4. Therefore, we concluded that if we put coloured jars under a light source, the darkest most colour would have the highest heating capacity. And, if we cooled this colour set at the same temperature, the darkest colour will cool the fastest.
1. Do not touch the heated jars without gloves.
2. Dry the jars before experimenting.
3. Use enamel paint only.
4. Record your observation carefully.
In this experiment, we determined the colour of jars that had the highest emission, absorption, and radiation capability.
Q.1 What was the aim of your experiment?
ANS. We aimed to determine which colour of jar radiates, emmit and absorbs more heat.
Q.2 Which coloured jar attained the highest temperature?
ANS. The green coloured jar attained a temperature of 63 degrees celsius.
Q.3 Which coloured jar cooled the fastest?
ANS. The cooling rate of all the coloured jars was almost similar but the black coloured jar cooled more rapidly.
Q.4 What was the result of your experiment?
ANS. We concluded that if we put coloured jars under a light source, the darkest colour would have the highest heating and emission capacity. And if we cooled this color set from the same temperature, the darkest colour would cool the fastest.
An Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research.