|
Materials Required
|
* 3 cups of water
* 3 different colored cups
* Salt
* Refrigerator to freeze
|
|
|
|
Method
|
- Take 1 cup of water and add a pinch of salt in it, then add ½ teaspoon salt in the other cup and 1 teaspoon salt in the last cup of water.
- Mark the cups indicating amount of salt put in each cup and put all of them in the freezer to freeze.
- Note the time taken by each of the water to become ice.
|
|
What is Learnt
|
The cup of water having a pinch of salt freezes first followed by the cup with ½ teaspoon of salt and then the cup of water that has 1 teaspoon of salt.
So freezing point decreases with the increase in amount of salt.
|
|
Conclusion
|
* The increase in proportion of salt brings down the freezing point of water.
* Hence oceans and seas that contain more salt never freeze.
|
Flash Cards