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Method for determining density of cotton through water drainage technology

A drainage method and cotton technology, which is applied in the field of density measurement of fluffy cotton, can solve the problems of complicated equipment, inability to directly measure the volume, cumbersome measurement method, etc., and achieve the effect of small measurement error, avoiding cotton water absorption, and easy detection.

Inactive Publication Date: 2016-08-17
SHAANXI NORMAL UNIV
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Problems solved by technology

The problem is that for fluffy solid substances with strong compressibility and strong water absorption capacity, the above method obviously cannot directly measure its volume, and the experiment needs to be improved to meet the needs of junior high school students for the density of cotton-like solid substances. Determination method
[0003] The patent (application number: 201510259317.1) uses air pressure method to measure the density of cotton. For junior high school students, the equipment is complicated, the measurement method is too cumbersome, and the theoretical formula is beyond the scope of junior high school students' understanding

Method used

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  • Method for determining density of cotton through water drainage technology

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Embodiment Construction

[0013] The implementation of the technical solution of the present invention will now be further described.

[0014] (1) Take the vacuum packaging bag and weigh its quality with a balance as m 1 , put it in a measuring cylinder filled with 60mL of water until it is completely submerged, and use the drainage method to measure the volume V of the vacuum packaging bag 1 =V 1 '-60, V 1 ' is the volume V corresponding to the water after the vacuum packaging bag is submerged 1 ';

[0015] (2) Dry the vacuum packaging bag with a fan, put the cotton in the vacuum packaging bag, and vacuum it to 10 with a vacuum pump. 3 ~10 4 Pa, weigh the vacuum bag filled with cotton and vacuumized with a balance, and the total mass is m z ;

[0016] (3) Cotton is housed and the vacuum bag that is vacuumized is placed in the measuring cylinder that fills with step (1) equal amount of water, and the total volume V of vacuum bag and cotton is measured by drainage method Z =V z '-60, V z ' is ...

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Abstract

The invention relates to a method for determining the density of cotton through a water drainage technology. The method comprises the following steps: respectively measuring the volume of a vacuum packaging bag and the volume of a vacuum packaging bag provided with cotton by using a measuring cylinder water drainage technology, calculating the mass and the volume of cotton through a differential technology, and calculating the density of the cotton. The vacuum packaging bag is waterproof, so water absorption of the cotton is avoided, detection is convenient, the measurement error is small, and the result is accurate; and the determination method is simple and understandable, and is simple to operate.

Description

technical field [0001] The invention relates to a method for measuring the density of a compressible solid, in particular to a method for measuring the density of fluffy cotton. technical background [0002] There is a very important physical quantity in middle school physics textbooks, which is density. Density is defined in junior high school physics textbooks as an inherent physical quantity of matter itself, which is the mass per unit volume, that is At the same time, measuring the density of substances is also an experimental method that junior high school students must master. Obviously, to measure the density of a substance according to the formula, one only needs to know the mass of the substance and its actual volume to calculate its density through the formula. For a solid object with regular geometric shape, its mass m can be measured by a balance, its volume can be measured by a vernier caliper, or the volume v of an irregular substance can be directly measure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N9/02
CPCG01N9/02G01N2009/026
Inventor 沈壮志王英瑞张明铎
Owner SHAANXI NORMAL UNIV
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