Figure 8.2 shows a child blowing air with a straw near the opening of another straw which has its other end in a soft drink bottle. It was observed that the level of the soft drink in the straw rises up as soon as air is blown over its open end. Which one of the following best explains the reason for rise in level of the drink?

Question

Figure 8.2 shows a child blowing air with a straw near the opening of another straw which has its other end in a soft drink bottle. It was observed that the level of the soft drink in the straw rises up as soon as air is blown over its open end. Which one of the following best explains the reason for rise in level of the drink?

Philoid · Accepted Answer

As we know that the high speed winds have low pressure because winds flow from high pressure area to low pressure area and when they are reaching low pressure area their pressure would eventually decrease as they are going to the low pressure area to create the balance and hence their speed also increases at the path.

When we blow air it gets distributed and hence it’s pressure decreases and the speed of it’s travelling increases due to the energy of blow.