How to calculate the density of the body, how to calculate the density of the person

Density = mass volume, e.g. density of water = 1 ton cubic meter.

The mass is reversed, the volume is more, and different shapes are calculated differently. The simplest length*width*height = cube volume.

The law of change in density.

Generally speaking, no matter what substance it is in, no matter what state it is in, with the change of temperature and pressure, the volume or density will also change accordingly. The relationship between the three physical quantities of temperature t, pressure p, and density (or volume) is called the equation of state. The volume of a gas varies significantly depending on the pressure it is subjected to and the temperature it is subjected to.

For an ideal gas, the equation of state is.

where r is the gas constant, which is equal to m2 (sec2*keon). If its temperature does not change, the density is proportional to the pressure; If its pressure is constant, the density is inversely proportional to the temperature. For general gases, if the density is not large and the temperature is far away from the liquefaction point, its volume changes with pressure and is close to the ideal gas; For gases with high density, the above equation of state should also be appropriately modified.

The density of a solid or liquid substance changes only slightly when temperature and pressure change. For example, around 0, the temperature coefficient (the rate of change in the volume of an object when the temperature increases by 1) is mostly around 10-9 for various metals. The pressure in deep water and the pressure under water** can reach several hundred atmospheres, or even higher (1 atmosphere = 101325 Pa), and the change in density with pressure must be taken into account.

Cole recommends the following equation of state:

where p0 is the density of water at atmospheric pressure. If n and b are taken as 7 and 3000 atmospheres, then up to 105 atmospheres, the errors of the above equations and measured data are within a few percent.

In nature as a whole, extreme pressures can cause the density of matter in some celestial bodies to vary greatly from the usual density, such as neutron stars, which can reach a density of 10 grams3.

<> formula for estimating men's body density: (A is the sebum of the upper arm, B is the sebum of the scapula); The estimation formula of Bizhouyuan for women's body density: (A is the sebum of the upper arm, and B is the scapula sebum).

In 2006, the sebum thickness monitoring value of the upper arm of men aged 25-29 was scapular sebum monitoring, and the monitoring value of sebum thickness of the upper arm of women aged 25-29 years was scapular sebum monitoring in 2006. Then there are: men's body density =; Woman body density = .

The density of the human body is only g cm, which is only a little more dense than water. Gasoline is less dense than water, so oil stains you see on the road will float on the water. Seawater is denser than water, so it is easier for the human body to float in seawater.

The density of the Dead Sea reaches a density greater than that of the human body, so people can float in the Dead Sea. ）

Man body density =

Woman body density = .

The formula for estimating the density of the human body in men: (A is the skin of the upper arm, B is the scapular sebum); The formula for estimating the density of a woman's body: (A is the sebum of the upper arm, B is the sebum of the scapula).

In 2006, the sebum thickness monitoring value of the upper arm of men aged 25-29 was scapular sebum monitoring, and the sebum thickness monitoring value of the upper arm of women aged 25-29 years old in 2006 was scapular sebum monitoring. Then there are: men's body density =; Raid on the filial woman's body density =.

Estimation of men's body density Gonghui dress-up: (A is the sebum of the upper arm, B is the sebum of the scapula); The formula for estimating the density of a woman's body: (A is the sebum of the upper arm, B is the sebum of the scapula).

In 2006, the sebum thickness monitoring value of the upper arm of men aged 25-29 was scapular sebum monitoring, and the sebum thickness monitoring value of the upper arm of women aged 25-29 years old in 2006 was scapular sebum monitoring. Then there are: men's body density =; Woman body density = .

Density is the ratio of the mass to volume of a substance, which is usually expressed by the formula: density = mass volume.

where mass is the mass of the object, usually in kilograms (kg) or grams (g), and volume is the space occupied by the object, usually in cubic meters (m) or cubic centimeters (cm).

To calculate the density, you need to first measure the mass and volume of the object. Mass can be measured by using a balance or other mass measuring instrument. Whereas, volume can be measured using different methods depending on the shape and size of the object.

For example, for a regularly shaped object, an instrument such as a ruler or caliper can be used to make careful dimensional measurements, and then the volume is calculated according to the geometric formula of the shape. For irregularly shaped objects, the volume can be measured using methods such as volumetric bottles or the water level method.

Once the values of mass and volume are obtained, they are substituted into the formula for calculating density, and the numerical values of density can be calculated. The most common unit of density is kilograms per cubic meter (kg m), but the unit of density may vary for different materials.

It should be noted that density is a physical property, and for the same substance, its density is constant under certain temperature and pressure conditions. Density can provide information about the specific properties of substances, which plays an important role in identifying substances and studying the properties of substances.

Why is there a huge difference in the density of substances of the same volume, such as iron and cotton?

Density is the ratio of mass to volume of a substance, so there may be differences in the density of different substances. This is due to differences in the atomic or molecular structure, mass, and arrangement of different substances.

For example, iron is a metal with a tightly packed atomic structure and a high mass. Comparatively speaking, cotton is a natural plant fiber composed of fibers, which has a loose structure and a relatively light weight. When comparing iron and cotton with the same volume, the density of iron is relatively high due to the wider quality of iron; Whereas, cotton is of smaller mass and its density is comparatively lower.

Therefore, despite having the same volume, the density of iron and cotton varies greatly. This also illustrates the property of density, i.e., density is an indication of the properties of a substance and can be used to distinguish between different substances and their properties.

For practical applications, the difference in density also enables us to use density for separation, screening, and identification of substances in experiments and industrial processes, e.g. by density gradient centrifugation, fluid flow measurement by density detectors, etc. It is important to note that density is affected by temperature and pressure, so the same temperature and pressure conditions are often taken into account when making density comparisons.

The formula for calculating the density is: =m v, the density of the object ( ) is obtained by dividing the mass staring god (m) by the volume (v), if the problem of the state and space fruit is the gravity of the object (g), then you need to divide the gravity (g) by g (10n kg) to get the mass of the object and then find the density.

Density is a measure of the mass within a specific volume, density is equal to the mass of an object divided by volume, which can be expressed by symbols, in the International System of Units and the Chinese legal unit of measurement, the unit of density is kilogram meters3.