# Working with a lactometer

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Two graduations on the stem of a lactometer are 0.6 and 0.9. Find the graduation exactly midway between them.

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## SOLUTION This solution is **FREE** courtesy of BrainMass!

If V cm^3 is the volume of the bulb and the stem up to the reading 0.9, the weight of the lactometer = V * 0.9 gm

Let l be the length of the stem between 0.9 and 0.6, and a be the area of cross-section,

(V + l a) * 0.6 = V * 0.9

or l a = v/2

If R is the reading midway between 0.9 and 0.6,

[V+(l*a/2)]*R = V * 0.9

[V + (V/4)]R = V * 0.9

From this, R = 0.72

Â© BrainMass Inc. brainmass.com December 24, 2021, 4:47 pm ad1c9bdddf>https://brainmass.com/physics/work/working-lactometer-7681