NIOS Class 10 Science Activity 14.1 Thermal Energy

In this activity, we will learn the expansion of liquids. We know that liquids do not have a definite shape, so we will measure expansion through volume expansion.

 

NIOS Class 10 Science and Technology (212) Project File

This activity is based on the NIOS Class 10 science and technology (212) Chapter 14- Thermal Energy, Module 4.

Demonstration of Expansion in Liquids

Aim

 To observe the expansion in liquids on heating

Materials Required

   1. Transparent glass bottle

   2. Cork

   3. Transparent plastic pipe

   4. Water

   5. Burner or spirit lamp

   6. Marker

Procedure

 We will take a transparent bottle and fill it with water up to the brim, and insert a cork into the bottle. Now we fix a plastic pipe in the hole of the cork and let its lower end dip into water. The water rises in the pipe to a certain height, and we will mark it as level A.

 Now we heat the bottle and observe the change in the water level in the pipe.

Observation

Initially, the water level in the pipe falls from A to B (the lower level), but after further heating, the water level rises to a higher level, C.

Explanation

Initially, the water level falls from A to B because the glass(bottle) expands and its volume increases for some time.

But when the water in the bottle gets heated, it expands and the water level rises above he initial mark A to a higher point C.

Conclusion

 This activity explains and demonstrates that:

   1.  Liquids expand on heating.

   2. Water expands more than the glass at the same temperature.

Frequently Asked Questions

   1. Why does the water level fall after heating starts?

Answer – The glass bottle expands with the heating, which increases its volume, so the water level falls at first.

   2. Why does the water level rise above the initial level after some time?

Answer – After some time, the water starts expanding and rises above the initial level.

   3. What does this activity 14.1 NIOS class 10 science prove?

Answer – It proves that liquids expand on heating, and their expansion is greater than that of solids.

Related Topics

1. Activity 14.2