How to convert density What is the formula for density conversion?

The principal unit of density in the SI unit is "kg m".

The density of iron is 78 103 kg m3 () g cm3. This problem can be solved by using the basic method in unit conversion, that is, how many times the unit in the molecule becomes smaller, and the converted value becomes several times larger: 1 kilogram 103 grams; How many times the unit in the denominator becomes smaller, and how many times the converted value will become smaller:

1 m 3 106 cm 3, therefore, 7 8 10 kg m 3 7 8 103 (103 106) g cm 3 7 8 g cm 3; According to this conversion method; There is a law in the unit of density, that is, for the density of a substance, when the unit is used as "gram centimeter 3", "kilogram decimeter 3" and "ton meter 3", their values are the same. For example, the density of iron, according to this law, can be known:

Water 7 8 g cm 3 7 8 kg dm 3 7 8 tons m 3. This "7 8" is obtained by removing 103 from the density value of iron in the density table in the textbook. Keeping this rule in mind not only brings great convenience to the conversion of density units, but also makes some problems involving density calculations simpler.

For example, if you use this method to calculate the mass of water, the mass of 1 cm3 (ml) of water is 1 gram, the mass of 1 decimeter3 (liter) of water is 1 kg, and the mass of 1 meter3 of water is 1 ton.

Such composite units can be swapped individually.

The conversion of the molecule g to kg is divided by 1000

The conversion of the denominator in cubic centimeters to cubic meters is to divide by 10 6, and the denominator divided by 10 6 is equivalent to multiplying the whole formula by 10 6, so the entire density conversion is multiplied by 1000

That is, = kilograms cubic meters.

If it's a single unit with the same length, it depends on the inherent conversion rate between them!

The formula for calculating the density is:＝m/v ；The unit of density is kg m, (also: posture deficiency refers to g cm), 1g cm = 1000kg m.

The unit of mass m is: kilograms.

The unit of volume v is m.

Density and life.

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.

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

The formula for calculating the density:

where v is the volume element containing the p point; Swift.

m is the mass of the volume element. In the centimeter·gram·second system, the unit of density is gram centimeter3.

In the International System of Units and the Chinese legal unit of measurement, the unit of density is kilogram m3.

The formula for density is: density = mass volume.

where mass is the mass of the object (in grams or kilograms) and volume is the volume of the object (single dry dissolution is cubic centimeters or cubic meters).

If the density and mass are known, the volume can be calculated using the following formula: spring mess.

Volume = Mass Density.

If the density and volume are known, the mass can be calculated using the following formula:

Mass = Density * Volume.

It should be noted that the unit of density is usually grams of cubic centimeters or kilograms of cubic meters, the units of mass are grams or kilograms, and the units of volume are cubic centimeters or cubic meters. If the units are inconsistent, you need to convert the units first.

The density is calculated by =m v.

The density is calculated by =m v[1], where m is the mass of the substance and v is the volume of the substance. Using the above formula, the density of a specific substance can be measured. The principal SI units of density are:

kilograms per cubic meter, another commonly used unit is: grams per cubic centimeter.

The conversion relationship between the two commonly used density units is as follows: 1g cm 3 = 1000kg m 3 The density unit is a "composite" unit (derivation unit), that is, it consists of mass units and volume units. Commonly used mass unit conversion: 1t=1*10.

Scientific Applications of Density:

1. Identify the materials that make up the object. Density is one of the properties of matter, each substance has a certain density, and the density of different substances is generally different. Therefore, we can use density to identify substances.

The method is to determine the density of the substance to be measured, and compare the measured density with the density of various substances in the density table, so that you can identify what kind of substance the object is made of.

2. Calculate the composition of various substances contained in the object.

3. Calculate the mass of an object that is difficult to weigh or the volume of an object with a complex shape.

According to the variation of the density formula: or, the mass and volume of the object can be calculated, especially some problems where the mass is fast and the volume is inconvenient to measure directly, such as calculating the volume of an irregularly shaped object, the mass of a monument, etc.

4. Determine whether the object is solid or hollow.

5. Use density to calculate the internal pressure and buoyancy of the liquid.

6. Identification of unknown substances, for example, "argon" is discovered by calculating the density of unknown gases. After many experiments and spectral analysis, it was confirmed that the air contained a new gas body that was not known before, and named it argon. <>

Density calculations should be done with precautions:

1) Unit volume.

The mass of a substance is called the "density" of the substanceDensity is the ratio of the mass m of a substance to its volume v and is defined as.

MV According to the definition, in SI, the unit is kilogram per cubic meter (kg m3) and the dimension is ml-3.

2) Apparent density.

The ratio of the mass of a porous solid (granular or powder) material to its representational volume, including the volume of "pores".

3) Actual density.

The ratio of a porous solid material to its rest product (excluding the volume of pores).

4) Bulk density.

The ratio of the mass of a loose (small pieces, granules, fibers) material to the volume occupied in a container of a given volume under certain conditions.

Specific conditions bridge fujian refers to natural accumulation, vibration or knocking, or accumulation of a certain amount of pressure, etc.

5) Standard density.

The density of the substance under the standard conditions specified in the specification. For example, the standard density of the air hall motif at a temperature of 101325 pA (latm); Temperature: 20, pressure (latm) of the standard density of the liquid.

6) Reference density.

The density of the substance at a specified reference state (temperature and pressure).

7) Relative density.

The ratio of the density l of the substance to the density of the reference substance 2 under certain conditions. It is defined as:

d=ρ1/ρ2。

Relative density, which used to be called "specific gravity". "Specific gravity" usually refers to the ratio of the density of a substance to the density of pure water, which is included in the concept of relative density described above. Historically, there was also a definition of "specific gravity", d=g v, that is, weight per unit volume, which shows that the concept of "specific gravity" itself is rather confusing and is no longer used.

Density is an important physical quantity to characterize the properties of a substance.

And the mass of the same substance per unit volume is a fixed value, and the mass per unit volume of different substances is different. Therefore, this property of a substance can be characterized by mass per unit volume.

Kilogram m3 (kg m3) = g cm3 (g cm3) = lb ft3 (lb ft3) 1 lb ft3 (lb ft3) = kg m3 (kg m3) 1 lb in3 (lb in3) = kg m3 (kg m3).

lb US gallon (lb gal) = kilogram m3 (kg m3) 1 pound English gallon (lb gal) = kg m3 (kg m3) 1 pound (oil) barrel (lb bbl) = kg m percolation finch 3 (kg clump early m3).

Specific gravity at density = 140 - 130api = specific gravity.

Density reduction and broadening.

1 kg m3

kg m3) = g cm3 (g cm3) = lb ft3 (lb ft3) 1 lb ft3 (lb ft3) = kg m3 (kg m3) 1 lb in3 (lb in3) = kg m3 (kg m3).

1 pound US gallon (lb gal) = kilogram m3 (kg m3) 1 pound English gallon (lb gal) = kilogram m3 (kg m3) 1 pound (petroleum) barrel (lb Qiaoxun bbl) = kilogram m3 (kg m3).

1. Binapan weight at Baumé density = 140 - 130 specific gravity at api=.

Conversion follows one principle; Convert separately.

For example, g cm 3 is converted to kg m 3

First of all 1g 1 1000 kg

1cm^3＝1/1000000 m^3

So 1 g cm3 1 1000 kg (1 1000000 m 3) 1000 kg m 3

Another example is the conversion of m s to km h

1 m＝1/1000 km

1s＝1/3600 h

So 1m s 1 1000 (1 3600) km h km h <>

1 kilogram cubic meter (kg m) = grams cubic centimeter (g cm) In the centimeter gram second system, the unit of density is grams cubic centimeters.

In the International System of Units and the Chinese legal unit of measurement, the unit of density is kilogram cubic meter.

Density is a measure of the mass within a specific volume.

The definition of density is the mass of an object divided by its volume.