2007-05-04 10:04:09 · 4 answers · asked by Anonymous in Science & Mathematics ➔ Alternative ➔ Other - Alternative
Because the atmosphere exerts approximately 14 pounds per square inch of pressure on the liquid in the glass. When you pucker your mouth and create a partial vacuum, there is a pressure difference between the top of the liquid in the glass and your mouth.
It's not so much that you are 'sucking' the liquid through the straw, as it is the atmosphere is 'pushing' the liquid through the straw into your mouth.
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2007-05-04 10:22:16 · answer #1 · answered by tlbs101 7 · 1⤊ 0⤋
You don't really suck juice from the glass, only from the straw where it flows into the vacuum created when you suck out the air or juice contained in the straw.
2007-05-04 18:10:26 · answer #2 · answered by David T 2 · 0⤊ 0⤋
difference of atmospheric pressure between your mouth and the liquid in the glass
2007-05-04 21:06:59 · answer #3 · answered by Anonymous · 0⤊ 0⤋
Because of the differing pressure that you create inside your mouth. Fluids will move from areas of more pressure to areas of less pressure.
2007-05-04 10:08:58 · answer #4 · answered by JLynes 5 · 0⤊ 0⤋