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# The Solar Heating and Night Cooling of Surfaces

by | Oct 30, 2022 | Physics, Experiments

Contents

## Introduction

In this experiment, we will be determining The solar heating and night cooling of coloured surfaces heat up in presence of sunlight and cool down under the night sky.

## Aim

To find how different kinds of coloured surfaces heat up in presence of sunlight and cool down under the night sky.

## Theory

1. How much light is reflected by the surface is determined by its colour.

2. The light energy that does not get reflected by the paint, turned into heat energy and increases the temperature of the surface.

3. Conservation of energy could be accomplished in several different ways, and the colour of paint is one of them.

4. Black colour absorbs the most light on the other hand white colour reflects the most light.

5. The colour of an object is determined by the light it reflects.

## Requirements

1. Paints,

3. Infrared thermometer,

4. Notebook.

## Procedure

Step 1: Set a number of samples with different paints on them on a foam insulation pad.

Step 2: Place this foam insulation pad on the ground under the sky.

Step 3: Now, let this pad heat up in the sunlight during the day and cool down in the night light during the night.

Step 4: Choose the time when the weather is clear.

Step 5: Using a hand-held infrared thermometer, measure the temperature various times during the experiment.

Step 6: During the experiment, keep track of the air temperature.

Step 7: Measure the sun elevation during the day as the angle at which the sun hits the surface determines the light received by that surface.

## Observation

1. We observed that the paint temperature was at the peak during midday and decreased as the angle of the sun decreased.

2. At night, we observed that all the paints were closely related to temperature.

3. Average temperature showed only a moderate change in temperature during the nighttime.

## Result

1. During the daytime, paints were actually hotter than the air. And during the late afternoon and night, paints were cooler than the air.

2. We can apply this experiment to transportation vehicles and selecting a suitable colour paint will help in keeping the vehicle at minimum temperature.

3. This can also be used in building energy-efficient houses.

## Precaution

1. Record the temperature carefully.

2. Do not forget to keep track of air temperature.

## Conclusion

In this experiment, we determined how the colour of paint gets affected by the temperature of 16 metal squares during daytime under sunlight and during nighttime under night light.

Q.1 What was the aim of your experiment?

ANS. To find how different kinds of coloured surfaces heat up in the presence of sunlight and cool down under the night sky.

Q.2 When was the temperature at its peak?

ANS. The paint temperature was at its peak during midday and decreased as the angle of the sun decreased.

Q.3 When was the temperature at its bottom point?

ANS. The paint temperature was at the bottom point during nighttime.

Q.4 What can you use as the result of your experiment?

ANS. We can use this experiment in building an energy-efficient house and in selecting a suitable colour paint that will help in keeping the vehicle at minimum temperature.

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