Question

1 Explain how liquid rises in a drinking straw.​

Answer 1

Answer:

What does this have to do with a straw? Well, think about what happens when you put a straw into liquid. The liquid rises in the straw, to exactly the same height as the liquid in the glass. That’s because the atmosphere is pushing down on the liquid in the glass. The atmosphere pushes the liquid in the glass up into the straw. Since the atmosphere is also pushing down on the liquid in the straw, the liquid rises, just until the force of the atmosphere on the liquid inside the straw exactly balances the force of the atmosphere inside the glass. That happens when the levels are even.

So, why can you use a straw to get the liquid up into your mouth, higher than the level in the glass? When you inhale through the straw, you take the atmosphere out of the straw (it goes into your lungs). Now the atmosphere is pushing down on the liquid in the glass, with noting the balance it inside the straw, so the liquid rises…into your mouth!

Since we can’t see the atmosphere, it’s hard to figure out how it works. Scientists deal with this problem all the time. Designing experiments to measure things that can’t be seen is a big part of a scientist’s job. Here are a few experiments you can try to see the atmospheric.

When you turn the cup over and push it into the water, the air in the cup pushes away the water and the tissue stays dry.

Explanation:

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