Measuring Density with a Hydrometer A hydrometer, a device for measuring fluid density, is constructed as shown in
Figure 15-30. If the hydrometer samples fluid 1, the small float inside the tube is submerged to level 1, When fluid 2 is sampled, the float is submerged to level 2. Is the density of fluid 1 greater than, less than, or equal to the density of fluid 2? (This is how mechanics test your antifreeze level. Since antifreeze [ethylene glycol] is more dense than water, the higher the density of coolant in your radiator the more antifreeze protection you have.)
FIGURE 15-30
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