Freeze Over (61 Near Nature Experiments)

You will need:

  1. 2 zip-lock bags (1 bigger
    than the other)
  2. Crushed ice
  3. Salt
  4. Water
  5. Thermometer

In winters, while lakes and ponds freeze over the oceans don’t. Figure out with this experiment.

INSTRUCTIONS

  1. Fill the bigger zip-lock bag with crushed ice and one cup of salt. Mix it up well.
  2. Keep massaging the bag between your hands till all the ice has melted. Take the temperature of the water. It should be below zero.
  3. Next, take the smaller bag and fill it up with water. Shut the zip-lock.
  4. Place the smaller bag of water into the bigger water and salt bag and shut the zip-lock of the bigger bag as well.
  5. Leave the bags for some time, until the water in the smaller bag freezes. Take it out and record its temperature. Note whether the water in the bigger bag froze or not.

RESULT

The water in the smaller bag would have frozen in spite of the water in the bigger bag still being in a liquid state. This is because the salt in the bigger bag will break the molecules in the water which cause it to become ice. Hence the water may be in liquid state but its temperature would be way below freezing, which is what caused the pure water in the smaller bag to freeze.

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