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August 1, 2014

August 1, 2014

Posted by **MJ** on Wednesday, January 26, 2011 at 12:18pm.

gravity of a liquid. For example, producers of maple syrup use the hydrometer to find how much

sugar is in the collected sap. Markings along a stem are calibrated to indicate the specific gravity

for the level at which the hydrometer floats in a liquid. The weighted base ensures that the

hydrometer floats vertically. Suppose the hydrometer has a cylindrical stem of cross-sectional

area 0.400 cm

2.

The total volume of the bulb and stem is 8.8 cm

3

and the mass of the hydrometer

is 4.8 gm.

(a) How far from the top of the cylinder should a mark be placed to indicate a specific gravity of

1.00?

(b) When the hydrometer is placed in some oil, it floats with 7.25 cm of stem above the surface.

What is the specific gravity of the oil?

(c) What is the lowest specific gravity that can be measured with this hydrometer?

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