Briefly describe the common classifications of density meters

The instrument that measures the density of an object is a density meter
.

The basic principle of density meter measurement is to measure the degree of blackness after exposure and development of photosensitive materials, that is, blackness
.

In plate making, silver bromide on the photosensitive material is subjected to light action, and after development, it is reduced to metallic silver to form a photoresistant
.

High blackness, high density; Low blackness and low
density.

A meter with a filter can also measure the color density
of a color original.

The measurement principle is similar
to the above basic principle.

There are two kinds of commonly used density meters, one measurement density is greater than pure water density of liquid, called heavy meter; Another liquid with a smaller density than pure water is called a light meter
.

According to the application scenario of the density meter, the density meter can be divided into a benchtop density meter and a portable density meter
.

According to the different forms of substances measured, density meters can be divided into solid density meters, liquid density meters and gas density meters
.

According to the different working principles, density meters can be divided into hydrostatic type, vibration type, float type and radioisotope type of density meter
.

In plate making, silver bromide on the photosensitive material is subjected to light action, and after development, it is reduced to metallic silver to form a photoresistant
.

High blackness, high density; Low blackness and low
density.

A meter with a filter can also measure the color density
of a color original.

The measurement principle is similar
to the above basic principle.

A density meter used in physical experiments is an instrument
that measures the density of a liquid.

It is manufactured and worked on the basis of the principle that the buoyancy of an object floating in a liquid is equal to the force of gravity
.

A density meter is a sealed glass tube of uneven thickness and a lower part of which is filled with a small amount of dense lead pellet or mercury
.

When using, the density meter is placed vertically into the liquid to be measured, and when the density meter is stable, the density
of the liquid to be measured is read from its scale.