CN103344522A - Liquid density measurement method - Google Patents

Abstract

The invention relates to a liquid density measurement method, which is mainly used in experimental teaching in university and moderate speciality schools. The method comprises the following steps: measuring the mass m of a solid with the known volume v by using an electronic balance, wherein the solid is insoluble in liquid to be measured and the density of the solid is larger than that of the liquid to be measured; placing a container containing a liquid sample to be measured on the electronic balance, marking the reading of the electronic balance as m1, fixing one end of a filament, tying the other end of the filament with the solid with the mass m, soaking the solid in the liquid to be measured without touching the container, marking the reading of the electronic balance as m2, and figuring out the density of the liquid sample to be measured through the m, the m1, the m2 and the v. The method provided by the invention is simple, convenient, fast and high in measurement precision and is suitable for measuring the density of various kinds of liquid.

Description

A method for measuring liquid density

Technical field

The invention relates to a method for measuring liquid density, which is mainly used in experimental teaching in universities and technical secondary schools.

Background technique

Density is a physical parameter of matter. The common liquid density measurement methods include: conventional method, density bottle method, densitometer method, buoyancy method, floating body method, etc. These methods have the disadvantages of low measurement accuracy and complicated measurement.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the present invention provides a method for measuring liquid density, which can accurately and rapidly measure the density of various liquids.

The technical scheme that the present invention solves its technical problem adopts is, step 1: measure the mass m of a known volume ν, insoluble in the liquid to be measured, whose density is greater than the density of the liquid to be measured with an electronic balance; Step 2: put The container containing the liquid sample to be tested is placed on the electronic balance, and the reading of the electronic balance is m ₁ ; Step 3: One end of the thin wire is fixed, and the other end is tied to a solid with a mass of m, and the solid is immersed in the liquid to be tested , but not in contact with the container, the reading of the electronic balance is m ₂ , and the analysis of the force of the solid is as follows:

   …………… （1）

…………… (1)

In the formula, g is the local gravitational acceleration; step 4: the density of the liquid sample to be tested is obtained from formula (1):

 

        …………… （2）

…………… (2)

where ν is the volume of the solid.

即可求得待测液体样品的密度，此发明方法简单、方便、快速、测量精度高，且适用于各种液体样品。 The beneficial effects of the present invention are: measure the mass m of a solid with a known volume ν, insoluble in the liquid to be measured, and whose density is greater than the density of the liquid to be measured with an electronic balance, and place the container containing the liquid sample to be measured on the electronic balance above, the reading of the electronic balance is m ₁ , fix one end of the thin wire, and tie the other end to a solid with a mass of m, and immerse the solid in the liquid to be measured, but not in contact with the container, the reading of the electronic balance is m ₂ ,Depend on

The density of the liquid sample to be measured can be obtained. The inventive method is simple, convenient, fast, has high measurement accuracy, and is applicable to various liquid samples.

Detailed ways

The present invention will be further described below in conjunction with specific examples.

Embodiment 1 step of the present invention:

a. Use an electronic balance to measure the mass m of a solid with known volume ν in the air;

b. Place the container containing the liquid to be measured on the electronic balance, and the electronic balance reads m ₁ ;

c. Fix one end of the thin wire on a bracket, and tie the other end to a solid with mass m and known volume ν, and immerse the solid in the liquid to be measured, but not in contact with the container, and the electronic balance reads is m ₂ ;

得到待测液体的密度。 d. by

Get the density of the liquid to be measured.

Embodiment 2 steps of the present invention:

a. Use an electronic balance to measure the mass m of a solid with known volume ν in the air;

b. Place the container containing the liquid to be measured on the electronic balance, and the electronic balance reads m ₁ ;

c. Hold one end of the thin wire by hand, and tie the other end to a solid with mass m and known volume ν, and immerse the solid in the liquid to be measured, but not in contact with the container. The electronic balance reads as m ₂ ;

得到待测液体样品的密度。 d. by

Get the density of the liquid sample to be tested.

Claims (1)

1. liquid density measurement method, it is characterized in that, adopt following steps: with electronic balance measure a known volume ν, be insoluble to testing liquid, its density is greater than the quality m of the solid of testing liquid density, and the container that fills testing liquid is placed on the electronic balance, the electronic balance reading is m ₁, an end of fine rule is fixed, it is that the known volume of m is the solid of ν that the other end hitches quality, and with this solid immersion in testing liquid, but do not contact with container, the electronic balance reading is m ₂, by

Try to achieve the density of testing liquid.