A meat baster consists of a squeeze bulb attached to a plastic tube. When the bu

Question

A meat baster consists of a squeeze bulb attached to a plastic tube. When the bulb is squeezed and released, with the open end of the tube under the surface of the basting sauce, the sauce rises in the tube to a distance h, as the drawing shows. Using

1.013

A meat baster consists of a squeeze bulb attached to a plastic tube. When the bulb is squeezed and released, with the open end of the tube under the surface of the basting sauce, the sauce rises in the tube to a distance h, as the drawing shows. Using 1.013 times 105 Pa for the atmospheric pressure and 1010 kg/m3 for the density of the sauce, find the absolute pressure PB in the bulb when the distance h is (a) 0.15 m and (b) 0.09 m.

Explanation / Answer

The pressure difference dP from the top to the bottom of a liquid column of height h = gh*density. Then at the top of the column and in the bulb, P = 1.013*10^5 Pa - dP = 1.013*10^5 - 9.8*0.15*1010 = 99815.3 Pa (for question a)

for b dP = 1.013*10^5 - 9.8*0.09*1010=100409.18 pascal

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