把wax痴在吸管上 - Ans.fyi 參考答案

把wax痴在吸管上

2013-03-04 2:48 am

take a milk bottke and fill it with water.put a drinking straw in it. fix wax around the drinking straw at the top the bottle and make sure you have an airtight joint so that no air can go in and escape.can you suck the water out of the bottle?

中或英解也可.thx

回答 (1)

天同

2013-03-04 3:15 am

✔ 最佳答案

No. You cannot suck out water from the bottle.

In normal circumstance, when you suck water (or any liquid) using a straw, you are actually sucking out the air inside the straw. As a result, the air pressure above the water pushes the water to go into the straw and then into your mouth.

In the presence of the wax to make the mouth of the bottle air-tight. When you suck out the air inside the straw, the air above the water in the bottle tends to force the water into the straw. But once the water enters the straw, the air pressure inside the bottle reduces (because the bottle is made air-tight). The water in the straw will then return into the bottle. You could never suck the water out.

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