What is the bulk density? What is the density of the volume calculation formula

Bulk density refers to the volume of a material in its natural state, including the material entity and its openingsKeep your mouth shutpore conditionsUnit volumequality. The bulk density is calculated by the formula: v=pm.

where — the bulk density of the material, kg m3 or g cm3; m – the mass of the material, kg or g; v—— The volume of the material in its natural state, including the material entity and its open and closed pores.

For the volume of a regularly shaped material, it can be measured with a gage. Such as aerated concrete blocks.

The volume is measured block by block in the three directions of length, width and height, and its volume is calculated. The volume of irregularly shaped materials can be measured by the drain method or the wax sealing drain method.

Measurement method of bulk density

Balance Measuring Cylinder Method.

Method: Measure the mass m directly with a balance, and measure the volume v with a graduated cylinder.

Notes: 1. Solids with a density greater than water.

The mass is measured before the volume, so as to avoid the mass being too large after being wetted; Put it in water to remove air bubbles and avoid being too large.

2. Solids with a density less than water.

1) Press the method: use a thin wire and a pin to press all the objects into the water, which is convenient for measuring the volume.

2) Sinking aid method: first immerse all the sinking aid in the water in the graduated cylinder, and measure the total volume v1; Then, the object to be measured and the sediment object are immersed together, the total volume v2 is measured, and the volume of the object to be measured is calculated v=v2 v1.

What is the bulk density depends on the material situation, bulk density is a Chinese word, indicating that the material is in the solid area of the material.

In building materials, the ratio of the mass to volume of a material is called density. In different structural states, it can be divided into true density, apparent density and bulk density, and the apparent density can be divided into bulk density and apparent density according to its opening holes. The research and development of new functional materials is an important topic in materials science today.

At the same temperature, as the bulk density of the composite material increases, the volume expansion rate of the material also increases. At the same time, with the continuous increase of external temperature, its volume expansion rate also increases. In this process, the paraffin wax coated on the surface of the copper particles undergoes solid-phase crystallization and solid-liquid phase transformation, which causes its volume to expand.

When the composite material is pressed, it is carried out in a slow pressurization manner. The main reason is that if the pressurization rate is too fast, it is more difficult for the air to escape, but the pores are always there, which affects the volume expansion rate of the composite. In the study, it was found that according to the difference in compression before heating and the expansion after heating between the two groups of samples, not all the pores were completely discharged after the phase change of the paraffin, and only some were filled.

This filled part may come from the boundary of the specimen, and the pores near the center section are difficult to drain, which may be related to the fluidity of the composite.

The volume calculation formula density is: m v. The unit of density is kg m, (also: g cm), 1g cm = 1000kg m.

The unit of mass m is: kilograms.

The unit of volume v is m.

Density & 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 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 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.

Bulk density is the amount of dry material of a refractory material and its total volume (solids, open pores, andKeep your mouth shutThe sum of the volumes of the stomatus), i.e., the materialUnit volumemass, g cm3.

The bulk density characterization is the density of refractory materials, which is one of the basic indicators in the quality standards of all refractory raw materials and refractory products.

The bulk density of a material has a significant impact on many other properties, such as porosity, strength, erosion resistance, load softening temperature, wear resistance, thermal resistance, etc.

There is also a pair of lightweight insulation.

Such as insulating bricks, lightweight castables, etc., bulk density and its thermal conductivity and heat capacity.

There is also a close relationship.

Summary:

1) Bulk density of nano-copper paraffin.

The thermal expansion properties of composites have a significant effect, and the volume expansion rate of composites increases with the increase of bulk density.

2) When the bulk density is g cm3, the composite has a good volume expansion rate.

3) At 50, the composite material has good thermal cycling when the bulk density is g cm3, and the excessive bulk density will affect the pre-thermal stability of the composite.

1. Density is the data inherent in the substance, and it does not change with the change of volume and mass. For an object of the same density, the larger the volume, the greater the mass. The density of an object ( ) is obtained by dividing the mass (m) by the volume (v).

Calculation formula: =m v. Note:

m is the mass of the object, if you tell the gravitational force of the object (g), you should first divide the gravitational force (g) by g (10n kg) to get the mass of the object and then find the density.

2. Generally speaking, the main physical quantities that affect the density of matter.

for pressure and temperature. The density of the gas is significantly affected by pressure and temperature, and usually the gas is only given a standard condition.

or at room temperature and pressure, and the density in other cases can be determined by the equation of state of the gas (e.g. the equation of state of an ideal gas.

or van der Waals's equations).

3. The density of the liquid mainly depends on the composition of the liquid, and it is less affected by temperature (but sometimes it cannot be ignored). Very high pressures can also have a noticeable effect. The density of solids varies under the influence of temperature and pressure in a similar way to liquids, and is generally less pronounced.

Bulk density refers to the apparent density including all the pores within the volume of the material. In building materials, the ratio of the mass to volume of a material is called density. Main Effects:

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 the density of the old tomb to identify the material empty tomb. 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 to identify what substance the object is made of.

2 Calculate the composition of various substances contained in an 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 variant of the density formula: m=v or v=m, the mass and volume of the object can be calculated, especially for some problems where the mass and volume are inconvenient to measure directly, such as calculating the volume of an irregularly shaped object, the mass of a monument, etc.

4 Determine whether an object is solid or hollow.

Density:

Density is data that is intrinsically present in a substance and does not vary with volume and mass. For an object of the same density, the larger the volume, the greater the mass.

The density of an object ( ) is obtained by dividing the mass (m) by the volume (v). Calculation formula: =m v.

Note: m is the mass of the object, if it is the gravity of the object (g), you should first divide the gravity (g) by g (10n kg) to get the mass of the object and then find the density.