Advice 1: How to transfer milk in litres to kilograms

In everyday life and production, it is sometimes necessary to transfer fluid volumes in pounds. What calculations do we need? May be there is some device to translate one physical unit to another?
How to transfer milk in litres to kilograms
You will need
  • table of density of a substance.
Instruction
1
It argued that the weight of any liquid substances, the volume of which is equal to one liter corresponds to one kilogram. However, to verify this is confusing enough to remember a simple formula from school physics course: m=p*V, where m is the mass of the substance taken, p – density, V – volume. This formula clearly shows the direct dependence of the weight of the substance not only of its volume but also density. Therefore, it is impossible to translate the amount of the substance in weight, to be exact - liters into kilograms, as this is a completely different physical units. But it is possible to find out the mass of the substance fills this volume.
2
To translate liters into kilograms find its density. According to various sources the density of milk varies depending on the content in its composition of water, fat, skimmed milk solids from 1027 to 1032 kg/m3.
3
To obtain the average value of the density will add both values and divide the resulting number by two. The average value of the density of milk will be equal to 1029,5 kg/m3. Put a liter of milk in cubic meters (table data: 1 liter = 0,001 m3).
4
When substituting these values R=1029,5 kg/m3 and V=0,001 m3 in the formula: m=p*V (m=1029,5 kg/m3*0,001 m3), we get m=1,0295 kg.
So, one liter accommodates 1,0295 kg of milk.
Note
Only fresh water (R=1000 kg/m3) volume of one liter weighs one kilogram.
Useful advice
If you need to know about the capacity of a few liters of milk, you can use the following simple formula: N=n*m, where N is the total weight of substance (in Your case, milk), n is the number of units of the measured substance (liters), m – weight of substance in one liter (in kg).

Advice 2: How to convert kg to cubic meters

At the decision of physical tasks is often required to translate physical quantities from one system of measure to another. As a rule, this process does not cause special difficulties. Units of homogeneous physical quantities are linked through their respective coefficients (occasionally, simple formulas). However, in practice, sometimes you have to work with heterogeneous values and translate, for example, kilograms per cubic meter
How to convert kg to cubic meters
You will need
  • calculator
Instruction
1
To convert a known amount of kg per cubic meter, find the density of a substance to which he is transferred. To do this, locate the appropriate table of the density of a substance. For convenience of calculations the density of the substances in this table should be indicated in kilograms per cubic meter (kg/m3). This is the standard unit of density in the SI (system international).
2
Defining the table the matter density, use the following formula:
KMK = Kkg / P,

where: KMK – the number of cubic meters,

Kkg – number kg (kilograms),

P – density of the substance expressed in kg/m3.
For example, suppose you want to calculate what volume (how many cubic meters is 10 tons (10,000 kg) of decking.
Solution:
Find (online) the density of the decking. It is 800 kg/m3. Using the above formula, we can calculate that the number of cubic meters will be:

10000 / 800 = 12,5
3
It often happens that to determine the density of the substance in the tables difficult. For example, some tables may not be at hand or don't know the name of the substance. Sometimes items can be constructed from several materials, combined in unknown proportions. Moreover, even the known density of the substance (material) can vary within wide limits (for example, the density of wood depends on its moisture content).
4
If you define the density of matter in the following table, measure it yourself. For this (possible) separate a piece of material, preferably of regular shape and calculate its volume in cubic meters. For example, if boards, then sawed off smoothly about half-meter segment of the Board. Then measure (in meters) the length, width and thickness of the sample. Multiply these numbers – the resulting work would amount. Now weigh the scrap Board and divide his weight (in kg) to the previously calculated volume (m3). The resulting number will be equal to the density of the Board in kg/m3.
5
If the cubic meters it is necessary to translate a known amount of a kilogram of water or weak solutions of other substances, the liquid density can be taken equal to 1000 kg/m3. This density value can be used in the rough (estimated) calculations of the volumes of other liquids.
To get an accurate value of the density of the liquid, pour the liquid in a measuring cylinder or fill her a container of known volume. Then weigh the liquid container and divide its mass (excluding the weight of packaging) per volume. Follow the same procedure to obtain the density of bulk materials.

Advice 3: How to translate kilograms to liters

Kg - measure of mass of a substance used in the international system of units SI, and a liter is a volume measure, not included in this system. The physical characteristics of the bodies, measured in these units, are linked by a ratio that involves another parameter, the density of the substance. With the knowledge of two of the three options - for example, weight and density - to calculate the third volume is not working.
How to translate kilograms to liters
Instruction
1
Start from the General formula connecting the mass (m), density (p) and volume (V): V=m/p. For example, the initial conditions given the mass of liquid helium that is equal to 100 kg, and is proposed to calculate its volume at standard atmospheric pressure. The density of this substance is 130 kg/m3, so 100kg would correspond to a volume approximately equal to 100/130≈0,7692307692307692м3.
2
Put the units of the metric system, in which the obtained result of the calculation in liters. In the SI system to measure volume, use cubic meters, and holds one liter is one cubic decimeter, and therefore increase the resulting value a thousand times - so many cubic decimeters are each cubic meter. In your example the answer should be a value equal to 769,2307692307692 L.
3
When solving practical problems, consider the change in the density of a substance when heated. In various reference tables, the density of a liquid is given together with the indication of the measurement conditions, including temperature. And in various regulatory documents specify correction factors separately for summer and winter periods. For example, for diesel fuel summer correction factor equal to 1.03, and winter - 1,045.
4
If you define kilograms of the required liter volume solids, and still consider the heterogeneity of the material. For example, in stolitrovyh a barrel of sand contains not only the substance, but certain quantity of air between the individual grains. This number depends on the particle sizes (particle size) components of the bulk material. In addition, the easily deformable substances can be compacted, thereby increasing the average density. So, for example, the weight of cement of mark M500 in stolitrovyh barrel may not correspond to the calculations made based on the tabular density of the substance.

Advice 4: How to find the density of milk

The density of milk is called a lot of milk at the temperature of 20oC, contained in a unit volume. The density of milk is considered an indicator of its naturalness. Its determination requires the use of special devices.
The density of milk

The concept of density of milk



According to generally accepted standards, the density of milk is the density of such component parts as milk fat, lactose, proteins and salts. In fact, the density reflects the content in the milk of all these components. For density, you can determine whether milk is diluted with water or not.

In determining the milk density, it is recommended to check the equipment used. We are talking about echodensity that accuracy may be completely unsuitable for such measurements. To determine this characteristic is common to use milk glass hydrometers. By the way, this value should be determined not sooner than two hours after milking cows.

How to determine the density of milk?



To determine the exact density of milk will be required to prepare a measuring cylinder of 250 ml with a diameter of 5 cm and echodensity. You should also find out if lastdelimiter tested in the laboratory of measures and measuring instruments. Be sure to read the results of this test. If the instrument is all right, you can start the density measurement.

Take milk, cooked to analyze, carefully along the wall, pour it into the cylinder to 2/3 volume. Make sure that during the pouring was not formed foam. Then take a dry echodensity and dip it in milk. The device must be in a free floating condition. About a couple of minute fluctuations echodensity must stop. This will mean that the time has come to measure the density and temperature of milk on the upper edge of the meniscus. The eyes should be level with the line of the meniscus.

Perform the measurement twice. Be sure to slightly push echodensity find the arithmetic mean of the two definitions. To determine the relative density of milk is highly recommended when the temperature of 20oC. If it was higher the density indications will need to add of 0.0002 for each degree. With decreasing temperature this value instead should be deducted. Incidentally, in the Guest there is even a special table amendments for test methods milk. It turns out that to determine the density of the milk will not require some specific knowledge. It is enough only to study in detail the sequence of actions.
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