The muscles of your mouth and lungs created a partial vacuum inside you, and the room's air then pushed the fluid into that partial vacuum. The fluid rising up a straw is caused by gravity pulling the atmosphere down creating its ~1bar of pressure. That simple vacuum can easily overcome “gravity” which is the opposite of what glerfers believe.ĭo you really think you've created a perfect vacuum inside your mouth each time you've had a milkshake? We can prove this easily by creating a vacuum using a straw and such up liquids due to the pressure differential between the vacuum in your straw and the liquid which is under atmospheric pressure. What the atmosphere does close to a planet is not one of those contexts. Most of it is so close to being a true vacuum that it's normally a silly waste of time to mention the difference. ![]() It's unfortunate that so many people think it is. There can be no pressure (water or air) at any distance from earth unless there is a barrier, or so-called “space” is not a vacuum. If it wasn't: why aren't we all dead from suffocating in argon and carbon dioxide? They're both denser than oxygen. Water vapour aside, it's pretty mixed up homogenously all the way up to. ![]() Different gases exist at each layer of the atmosphere - do you not agree?
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