A fully inflated balloon shrink when put into cold water, because

Options

A. water causes lesser pressure from outside on the balloon
B. water causes a pull on balloon which presses it
C. air Inside the balloon contracts due to cooling
D. rubber of balloon expands on cooling and compresses air inside

Answer

To solve the question of why a fully inflated balloon shrinks when placed in cold water, we can break down the explanation into clear steps:

### Step-by-Step Solution:

1. **Understanding the Initial Condition**:
- A fully inflated balloon contains air at a certain temperature and pressure. The air inside the balloon is at room temperature and occupies a certain volume.

2. **Effect of Cold Water**:
- When the balloon is submerged in cold water, the temperature of the air inside the balloon begins to decrease. This is due to the heat transfer from the warmer air inside the balloon to the colder water outside.

3. **Behavior of Gases with Temperature**:
- According to the gas laws, specifically Charles's Law, the volume of a gas is directly proportional to its temperature (in Kelvin) when pressure is held constant. As the temperature of the gas decreases, its volume also decreases.

4. **Contraction of Air**:
- As the air inside the balloon cools down, it contracts. This means that the molecules of air move closer together, resulting in a decrease in the volume of air.

5. **Resulting Effect on the Balloon**:
- Since the air inside the balloon is contracting, the overall volume of the balloon decreases, causing the balloon to shrink.

6. **Conclusion**:
- Therefore, the balloon shrinks when placed in cold water because the air inside it cools down, leading to a decrease in air volume due to contraction.

### Final Answer:
A fully inflated balloon shrinks when put into cold water because the air inside the balloon contracts due to cooling, resulting in a decrease in volume.