What is Bulk Density? How is it calculated?

Cylindrical: v sh

Cone: v 1 3sh

Positive trapezoidal object: v= s1 s2 open root number (s1*s2) 3*h volume of the ball: v=4 3 (pi * radius of the third power) box: v = length, width and height.

Cube: v = cubic of the side length.

The density of steel is:

The density of pig iron is about 2% impurity carbon).

The density of pig iron is.

Pure copper (electrolytic copper) density =

g cm3 The density of aluminium is.

The density we usually refer to refers to bulk density, that is, the mass density of a substance, referred to as density. It is defined as the unit volume of matter.

The concept of density.

The relationship between its mass and volume.

The formula for density.

Represents density; m is the mass: v is the volume.

Density is only related to the type of substance, not to the mass and volume of the object.

Since the mass of the same substance is proportional to the volume, the volume increases several times, and the mass also increases several times, and their ratio remains unchanged, so the density is only related to the type of substance, and has nothing to do with the mass and volume.

For students with a good foundation, they can deduce that different substances with the same volume have a higher mass and a higher density. Different substances with equal mass, larger volumes, less density.

Mass = density x volume.

The formula for calculating mass m

PV density formula: =m v

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 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.

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.

The relationship between density, volume, mass is: the density of an object is equal to the ratio of its mass to volume, which can be expressed as: density = mass m volume v.

Mass refers to the measure of the amount of the substance that carries regrets, which is a positive scalar quantity, which is often expressed by m; Density refers to the mass per unit volume of a substance, which is often denoted by . Whereas, volume refers to the amount of space occupied by a tan substance, which is often expressed by v.

So the relationship between density, volume, mass can be expressed as: =m v. That is to say, when the mass m does not change, the density is inversely proportional to the volume v, and the larger the volume is the less dense, and the smaller the volume is the higher the density.

In the same way, it can also be expressed as m= *v, v= m.

Density calculations should be done with precautions:

1) The mass of a substance per unit volume 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 refer to natural accumulation, vibration or knocking, or accumulation with a certain amount of pressure applied, etc.

5) Standard density.

The density of the substance under the standard conditions specified in the specification. For example, the standard density of a gas at a temperature of 101,325 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 that characterizes 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.

The formula for calculating the density:

where v is the volume element containing the p point;

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 calculating the density is: =m v, the density of the object ( ) is obtained by dividing the mass (m) by the volume (v), if the topic 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.

Density is equal to mass, divided by volume. If the problem is gravity, divide by g to get the mass of the object and find the density.

1. Density calculation formula 1Represents m, represents v, represents 2The SI unit of density is the density of water for which it denotes: 5Volume unit conversion 1cm3=ml=.

Use a 1 cubic centimeter container to put things in, and use an electronic scale to weigh the weight of the container to get the density, such as weighing 1 gram, which is a density of 1000 grams per liter.

Density is data that is intrinsically present in a substance and does not vary with volume and mass. The formula =m v is just a formula for calculating the density if you don't know it, not a causal formula.

m (mass) = v (volume) * p (density) For different substances, the density is directly proportional to the mass and inversely proportional to the volume Yes: p = m v, that is, when the mass m is constant, p (density) is inversely proportional to v (volume), and if the volume is large, the density is small, and the density is high if the volume is small. Again:

When the volume is constant, p (density) is proportional to m (mass), the greater the mass is the higher the density, and the smaller the mass is the smaller the density.

It's not, for example, 5=10 2, the dividend increases, the divisor does not change, and the number of gains increases, so it is not proportional or inversely proportional. And when the water solidifies into ice, the state changes, and the density changes.