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# Science Project on “Retaining Temperature”, Project Experiment Topics on Energy in Different Forms for Class 8, 9, 10 and 12 Students.

Retaining Temperature

Materials Required:

1 Salt

1. Two empty Two liter soda bottles
2. Two thermometers
3. Modeling clay
4. Hot tap water
5. A watch
6. Paper and pencil

Water takes greater time to change temperature. For example, if the weather has been hot for a few days and for one night it’s pretty cool outside, the warm temperature of a swimming pool will not change much. It will retain its warmth.

But does the heat energy of water depend upon the salt content in it?

To find out, fill 2 two-litre soda bottle with equally hot water. Now put eight teaspoons of salt into one of the bottles and dissolve the salt completely.

Then, lightly place the two balls of modeling clay over each of the bottle mouths, instead of screwing the caps on.

Now take two thermometers and push them in through the clay, so that the bulbs are into the water.

Every ten minutes, note down the temperature. When two hours have elapsed, compare your readings