What is hydrometer or hygrometer?

Answer 1

HydrometerA hydrometer is an instrument used to measure the specific gravity of a liquid solution and, therefore, its strength. A simple (and common) hydrometer consists of a weighted glass bulb with a graduated stem, looking similar to a large glass thermometer. It is placed in the solution, spun (to remove air bubbles that might cause it to float higher), then the column is read at the waterline to give a number that can be compared to a chart of known values for the particular solution being measured.

Hydrometers come in a variety of themes - the most simple consisting of a long glass tube into which is sealed a specific mass of a weight, and a strip of paper that is a graduated metric (looks like a ruler). The device is dropped into a liquid, usually water in this case, and the device will partially float, with the weighted end under water, and the rest of the device above the water line. At the point of the water line, one can see the strip of paper, and read from the paper, the metric. The metric will usually provide the specific gravity of the water, meaning, it will describe the weight of dissolved materials in the water.

The hydrometer is used in beer and wine making to determine when the solution has reached the desired concentration of alcohol. It is also used to determine the strength of acids and bases, of automobile fluids, and many other liquid solutions.

See the Web Links to the left for more information (and a picture) of a hydrometer.
according to MAA , the detail is with you.

Answer 2

To measure specifix gravity of a liquid. Many popular mechanics types are familiar with the so-called Wassermann type- which is used to test automobile batteries- 4.0 on each cell means proper charge level. There are other types used for brewers, chemical plants, etc. a related instrument is a Saccharometr, used to measure sugar content in fluids such as sodas. You could not and shoud not use the Battery type for this task!

Answer 3

A hydrometer is an instrument used for measure the specific gravity of liquids, which means the ratio of the density of the liquid to the density of water.

Answer 4

A hydrometer measures specific gravity of liquids. The ratio of the density of the liquid compared to the density of the water itself is what is measured.

Answer 5

A hydrometer is used for measuring the specific density of a liquid

Answer 6

Hydrometer is a simple instrument for the determination of the liquids relative densities (syn.: specific gravity).