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 1430 kg/m3 for the density of the sauce, find the absolute pressure PB in the bulb when the distance h is (a) 0.18 m and (b) 0.10 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 = 1.013E5 Pa - dP = 1.013E5 - 9.8*0.18*1430 = 98777.48 Pa (for question a). You can do the same for question b.

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