A hydrometer is a simple instrument used to measure the specific gravity of liquids. It has two connected parts: a glass bulb (weighted with a piece of metal) at the bottom and a cylindrical glass stem (with internal scale marks) at the top. When placed in a liquid, the hydrometer floats upright with some fraction of the stem extending above the liquid surface.
A hydrometer is a simple instrument used to measure the specific gravity of liquids. It has two connected parts: a glass bulb (weighted with a piece of metal) at the bottom and a cylindrical glass stem (with internal scale marks) at the top. When placed in a liquid, the hydrometer floats upright with some fraction of the stem extending above the liquid surface.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Transcribed Image Text:A hydrometer is a simple instrument used to measure the specific gravity of liquids. It
has two connected parts: a glass bulb (weighted with a piece of metal) at the bottom
and a cylindrical glass stem (with internal scale marks) at the top. When placed in a
liquid, the hydrometer floats upright with some fraction of the stem extending above
the liquid surface.
a. Draw the appropriate force balance diagram for when the hydrometer is
completely stationary in the fluid.
b. When a hydrometer (with bulb volume of 40 mL, bulb mass of 50 g, cylindrical
stem mass of 15 g, cylindrical stem diameter of 8 mm, and total cylindrical stem
length of 24 cm) is placed in an unknown liquid, it floats at a particular position
where the cylindrical stem extends 8.5 cm above the liquid surface - calculate
the specific gravity of this unknown liquid.
c. A colleague asks you to borrow the same hydrometer from part b to measure
the specific gravity of another unknown liquid that is believed to be
approximately 1.1. Give a brief explanation of why it is or is not a good idea to
let your colleague use it.
BU
L
B
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