2024年4月7日发(作者：coreldraw破解版网盘2020)

液体表面张力的测定（Determination of liquid surface tension）

Experiment five

Experiment five, experiment five

Experiment five

Determination of liquid surface tension

Determination of surface tension of liquids - Determination of

surface tension of liquids

Determination of liquid surface tension

Two billion eight million two hundred and one thousand two

hundred and five

2008201205 2008201205

2008201205 Liu senior adviser

Liu Zizheng Liu Zizheng

Liuzizheng

1 objective (1) to measure the surface tension of different

concentrations of ethanol aqueous solution, and calculate the

surface adsorption amount and the transverse of ethanol

molecule

Sectional area.

(2) understand the nature of surface tension and the

relationship between surface tension and adsorption capacity.

(3) grasp the principle of maximum bubble pressure method to

determine the surface tension and surface adsorption capacity

of solution. 2 the principle of experiment is that in a liquid,

the attraction of any molecule is balanced. But on the surface

of the liquid

Molecules are not the same. Because the molecules on the surface

layer are attracted by the inner layer molecules on the one hand,

and on the other hand, the molecules are exposed to the surface

layer

The attraction of the gas molecules outside the liquid is

greater than that of the latter. Therefore, on the surface layer

of liquid surface

In this case, each molecule is subjected to an unbalanced force

that is perpendicular to and pointing to the interior of the

fluid. This attraction makes the surface visible

The molecules push inward to produce the smallest area of the

liquid. In order to increase the surface area of liquid, it is

necessary to resist molecules

Increase the potential energy of a molecule by working inward.

So the molecules in the surface layer are larger than in the

liquid