Is measuring the density of water with a density meter an observation method?

The density of water is measured with a density meter, and the following density meter is measured by observation method, and the measurement range is a standard temperature of 20 and a total length of 330mm.

20 330 10 lower edge.

20 330 10 lower edge.

20 330 10 lower edge.

20 330 10 lower edge.

20 330 10 lower edge.

20 330 10 lower edge.

20 330 10 lower edge.

20 330 10 lower edge.

20 330 10 lower edge.

20 330 10 lower edge.

It mainly depends on what form of density meter is used, and the density meter Menghui MH5300 uses the principle of differential pressure to measure density, and the resonant principle of tuning fork density meter is used. **Density meter Shanghai Menghui.

It can be detected directly with an instrument.

Measuring the density of water in the experiment report 1.

1. Purpose of the experiment:

Master the principle of density measurement by hydrostatic weighing.

Learn about the characteristics of pycnometer density measurement.

Master the use of pycnometers.

Learn how to use a physical balance.

Second, the experimental principle:

The density of the object, which is the mass of the object, is the volume of the object. In general, there are three ways to measure the density of an object:

1. For objects with regular shapes.

According to , it can be measured directly by a physical balance, the length of which can be measured with a length measuring instrument, and then the volume is calculated. Then bring , into the density formula, to find the density.

2. For irregularly shaped objects, the density is determined by hydrostatic weighing method.

Measure the density of solids (copper rings).

According to Archimedes' principle, an object immersed in a liquid is subject to the upward buoyancy of the liquid, and the magnitude of the buoyancy is the state of the stateIf the solid (copper ring) is weighed by placing it in air and submerging it in water, the resulting masses are , and the density of the liquid (salt water) is measured.

Place the object (copper ring) in air, water and the liquid to be measured (salt water) respectively, and measure their masses respectively , , and the same can be obtained.

Measure the density of paraffin.

Paraffin density. --The mass of paraffin wax in air.

- The quality of the two when the paraffin wax and the copper ring are placed in the water.

- Paraffin wax in air, copper rings are weighed when placed in water.

3. Determine the density of liquid and insoluble solid particles by pycnometer method.

Measure the density of liquids.

- The quality of the empty pycnometer.

- The quality of the pycnometer when filled with the liquid to be measured.

- The quality of a pycnometer filled with pure water at the same temperature as the liquid to be measured.

The density of solid particles is

- The mass of the fine solids to be measured.

- The quality of the pycnometer and water after filling it with water.

- The total mass of pycnometer, water and the solids to be measured.

Problems that should be paid attention to when using graduated cylinders.

1) The graduated cylinder is an instrument used for measurement in the laboratory

2) The unit of the graduated cylinder is generally "ml", and the next digit of the minimum scale should be estimated when reading 1 ml = cm = m (3) The graduated cylinder must be placed on a horizontal plane, and then the liquid trembling potato is poured into the graduated cylinder

4) When observing the scale of the liquid level in the graduated cylinder, the line of sight should be the bottom of the concave shape when observing, if the liquid level is concave, the bottom of the concave shape shall prevail; If the liquid level is presented.

Convex, observe with the top of the convex

5) The method of measuring the volume of solids with a graduated cylinder (cup) is called

2. It is called density. 3. The formula for calculating density The SI unit of density is 4, and the density of water is kilogram m3, which is gram cm3. Purpose of the experiment:

1.further solidify the concept of the density of matter through experiments;

2.Learn how to use a graduated cylinder. One is the method of measuring the volume of liquid with a hand hole disturbance measuring cylinder; the second is the method of measuring the volume of irregularly shaped objects with a graduated cylinder; 3.Learn to measure the density of substances with graduated cylinders and balances. Experimental Principle:

ρ=" m/" v；Balance; Mass, volume.

Question Analysis: Determination of the density of a substance.

The principle is the formula for density =m v; In the experiment, the balance is used to weigh the mass of the object, and in the experiment of "the relationship between the mass and volume of the substance", the physical quantities to be measured are mass and volume.

The buoyancy of the CA density meter is equal to its own gravity, and the different immersion depths are due to the different density of the liquid, so the volume of the liquid discharged is different, and thus the depth is different.

b. The spring dynamometer can measure the tensile force.

d The frame of reference can select any state, in fact, the rest is relative, the motion is absolute, and any frame of reference we choose is also in motion.

1.Liquid density meter principle: equipped with U-shaped vibrating sample tube and with electronic excitation, vibration frequency counting and display functions.

2.In the process of measurement, the temperature of the sample can be accurately determined and has the ability to control the sample temperature, and at the same time achieve the accuracy required by the standard, a small amount of liquid sample is injected into the vibrating sample tube, and the change of the quality of the sample tube causes the change of vibration frequency, and the density of the sample is calculated in combination with the calibration data.

3.The density meter gravity is constant, floating or sinking according to the change of buoyancy, a functional density meter is in a floating state after being put into the liquid for a long enough time, at this time the force of buoyancy pushing up is equal to the force of seepage and pulling down in gravity.

4.When the gravity is greater than the buoyancy, the density meter will sink and the buoyancy increases, on the contrary, the density meter floats up, and the buoyancy decreases, when it is immersed in different liquids, the number is different due to the different immersion depths, and the iron sand or lead particles at the bottom of the meter can be used to maintain balance, and the gravity is also adjusted.

According to the density formula =m.

1. Use a balance to measure the mass m1 of a beaker, and then pour a certain amount of brine into the beaker to measure the total mass of the beaker and the brine m2, and the first mass of the brine m=m2-m1.

2. Pour the brine in the beaker into the graduated cylinder and measure the volume v of the brine solution.

3. Density of brine = m v.

The density of brine can be measured according to the formula density = mass volume, and the specific method is as follows.

1. Weigh the quality of an empty measuring cylinder as m1g.

2. Use a graduated cylinder with a known mass of m1 to measure a certain volume of saline, and the volume of saline is vml.

3. Weigh the mass of the graduated cylinder filled with VML saline as M2G.

4. Then according to the density = mass volume, the brine density = brine quality brine volume = (m2-m1) v, and the unit of brine density is g ml.

Expand the information of the exhibition:1. Density-related calculation formula.

Density = mass volume, mass = density x volume, volume = mass density.

2. The unit of density.

The units of density are g ml, g l, kg m 3, kg l.

3. Density measurement method.

1) Measurement method.

Use a balance to weigh the mass m of the metal block.

Fill the graduated cylinder with an appropriate amount of water and read out the volume of v1.

Tie the metal block with a string and put it into a graduated cylinder, immerse it, and read the volume as V2.

Calculated by the formula =m (v2-v1).

2) Gravity cup method.

Fill a beaker with water and place it on a balance to weigh the mass m1.

Gently place the metal block in the water, the spine overflows some of the water, and then place the beaker on the balance to weigh the mass m2.

Remove the metal block and place the beaker on the balance to weigh the beaker and the mass m3 of the remaining water.

Calculated by formula = water (m2-m3) (m1-m3).

The density of water is per cubic meter. The physical meaning of this is that the volume of one cubic meter of water is the mass of one cubic meter, i.e., one point zero times ten cubic kilograms, that is, one ton. In general, the density of water varies with temperature, the higher the temperature, the lower the density, and the lower the temperature, the greater the density.

What if you have a density of water? If you are interested in the physical meaning, please read on.

1. Regarding the density of water, it is worth noting that in the temperature range from 0 to this temperature, water will produce heat shrinkage and cold expansion, and the higher the temperature, the greater the density.

2. When the temperature is 0, the water will freeze, the density will drop, and all the molecules of the water will be associated together and become a huge association molecule.

3. When the temperature is, the density of water is the largest. At this time, the existence of water molecules is mostly in the form of (H2O)2 large bi-associated molecules, and the molecules occupy a small space.

4. If you want to measure the density of a liquid like water, you can use a balance, a beaker, a graduated cylinder, a glass bottle, etc., and the calculation formula is that the density is equal to the mass divided by the volume.

<> measure the density of liquids, you need to prepare a balance, a measuring cylinder, and a beaker. Fill the beaker with an appropriate amount of liquid, place it on the balance, and weigh the total mass of the beaker and liquid, marked as m1. A portion of the liquid in the beaker is poured into a graduated cylinder and the volume is measured, called v.

Place the liquid in the remaining beaker on the balance and measure the mass of m2. From this, it is concluded that the mass of the poured liquid is m1 minus m2. The volume of the poured liquid is v, and the density of the liquid is equal to (m1-m2) divided by v.

What is the density of water? I hope the answer to this question of physical meaning will be helpful to you.