Why is warm air lighter than cold air?When you drink a soft-drink using a straw, what forces the liquid to rise up in the straw?
Answers
Explanation:
Suck It.
This is an amazing question. I would love to answer it as my research has been more than thorough on this one, I asked this to myself sometime back. To sum it up the basic reason why this would happen is difference in air pressure. When you try pull the air out of the straw what happens is you create a low pressure region inside of the straw this means that in the current situation the air pressure which is forcing the liquid to stay inside the straw is higher than the one inside. This means that the liquid will have no other way but to go up to compensate for the pressure drop.
I’m not going to leave you here. I’ll go one step further.
Now the question you asked as simple as it may be is inherently very complex. What happens if you make the straw long enough and the suction on top is high enough that it creates a vacuum does it mean that the liquid will keep flowing out? What if we have a straw long enough to reach space and connect it to one of our oceans, can we drain them out? Well the answer is No, if the straw is long enough the liquid will reach up to a height that is fixed on earth it may vary depending on the density of the liquid ( for mercury it is 760 mm ). You know what now you know a way to measure atmospheric pressure (or any pressure as a matter of fact).