Homepage
KidzSearch
Play Fun Mobile Games.
Games
Cool Videos for Kids.
Videos
Talk About Anything
Q&A
Social Network for Kids
KidzNet
Explore Popular Images.
Pics
Explore the Best Sites for Kids.
Websites
Listen to Streaming Music for Kids.
Radio
Facts for Kids.
Facts
Read About Cool Topics.
News
Browse Over 200,000 Student Articles.
Wiki
Learn How to Search with Boolify.
Boolify
Discover KidzSearch Apps
Apps
A hydrometer is an instrument used to measure the specific gravity (or relative density) of liquids; that is, the ratio of the density of the liquid to the density of water it is used as water
A hydrometer is usually made of glass and consists of a cylindrical stem and a bulb weighted with mercury or lead shot to make it float upright. The liquid to be tested is poured into a tall container, often a graduated cylinder, and the hydrometer is gently lowered into the liquid until it floats freely. The point at which the surface of the liquid touches the stem of the hydrometer is noted. Hydrometers usually contain a scale inside the stem, so that the specific gravity can be read directly. A variety of scales exist, and are used depending on the context.