Why is water pressurized? What is the pressure of water?

1. Correctly understand the pressure of liquids.

Because the liquid is subjected to gravity, there is pressure on the bottom of the container on the object supporting it; Since the liquid is fluid, the walls of the container that hinder it also generate pressure; Liquid pressure can be measured with a piezometer.

The internal pressure of a stationary liquid has the following characteristics: there is pressure inside the liquid in all directions; The pressure increases with depth; At the same depth, the pressure of the liquid is equal in all directions. Liquid pressure is also related to the density of the liquid.

It is necessary to understand and apply the formula and p=rgh correctly. The formula is a pressure definition, whether it is a solid, liquid or gas, it is generally applicable. Why not use this formula to calculate the pressure of a liquid?

This is mainly because it is not easy to understand the pressure on a certain area of the liquid under normal circumstances, so it is difficult to calculate the liquid pressure. The formula p=r liquid 0 6gh is derived from the use of liquid r, h is easy to measure, so it is more convenient to calculate the liquid pressure with p=rgh.

When calculating the liquid pressure, it should be noted that h is the depth, which is the distance from the liquid side down to a certain place inside the liquid, not from the bottom of the container upwards, and h is not the height. Accurately judging the magnitude of h (as shown in Figure 1) is the key to calculating the pressure. Why does the depth start from the free surface of the liquid?

This is because the pressure experienced at a point within the liquid is generated by the gravitational force of that part of the liquid above it. From p=rgh, it can be seen that the pressure of the liquid is only related to the depth and density, but not to the weight and volume of the liquid as a whole. Pressure is not pressure, pressure is equal to the pressure per unit force area.

As shown in Figure (2), the two cylindrical containers with the mid-bottom area of S1 and S2 respectively contain water of the same height, and the pressure of the water in the two containers on the bottom of the container is equal to the gravity of the water, which is RGH1 and RGH2 respectively. Obviously, the bottom of the vessel with more water is under more pressure. According to the pressure formula, the bottom pressure p1=rgh; p2=rgh, p1=p2, indicating that the pressure per unit area of the bottom of the two vessels is equal.

It can be seen that the pressure generated by gravity of the liquid is small, which is only related to the density and depth of the liquid, but not the amount of liquid.

The pressure of a still liquid on the bottom surface of the container is not necessarily equal to the gravitational force of the liquid. From the formula of the internal pressure of the liquid and the relationship between pressure and pressure, the pressure of the liquid with the bottom area of s, the depth of h, and the density of r on the bottom of the container can be obtained p=rgh, and the pressure f=p 0 6s=rghs. This value is equal to the gravitational force of a liquid at the same depth in a cylinder with an equal upper and lower cross-section.

As shown in Figure (3)(a): G liquid = mg = RVG = RGHS, at this time, the pressure on the bottom surface of the container when the liquid is still is equal to the gravity of the liquid, that is, F pressure = G liquid. However, when the container is a bucket container with a large top and a small bottom (Fig. (b)), the pressure of the liquid at the bottom of the container is only equal to the gravity of the liquid plug surrounded by the dotted line, but less than the gravity of the whole liquid.

This can be simply understood as the pressure generated by the part of the liquid outside the dotted line acting on the sloping sidewall. So f pressure< g of liquid. And in Figure C, the side wall of the container has an oblique downward pressure on the liquid, so that the pressure at the bottom of the container is greater than the gravity of the liquid in the container, and it can also be simply understood as the pressure generated by the liquid column surrounded by the dotted line, that is, the pressure of the liquid on the bottom surface of the container is not equal to the gravity of the liquid.

All kinds of water have pressure. As long as there is weight, pressure is generated.

Water pressure formula: p= gh. Liquid pressure, referred to as hydraulics, refers to the pressure formed by the gravity of the liquid itself in the bottom, inner wall and interior of the liquid container.

Pascal's "split barrel" experiment is a good example of how liquid pressure is related to the depth of the liquid, because the pressure of the liquid is equal to the product of density, depth, and gravitational constant.

Water, with the chemical formula HO, is an inorganic substance composed of two elements, hydrogen and oxygen, which is non-toxic and drinkable. It is a colorless and odorless transparent liquid at room temperature and pressure, and is known as the source of human life.

Factors influencing the effect of pressure1. When the force area is constant, the greater the pressure, the greater the effect of the pressure.

2. When the pressure is constant, the smaller the force area, the greater the effect of the pressure.

The physical meaning of 1PA: The pressure on an area of 1 square meter is 1N.

1pa size: The pressure of a tiled newspaper on a horizontal tabletop, and the pressure of 3 sesame seeds on a horizontal tabletop is 1pa.

Note: When the contact area of the condensed cylinder and the contact surface is equal, p= gh can be used.

p—liquid pressure—pa.– Density of liquids – kilograms cubic meters (kg m).

g—usually g=10n kg).

h — depth (m, m).

The pressure of 1m water is. Because 1 standard atmosphere: 760 mmHg, 76 cmHg, 10 meters of water. So 1 meter of water is equal to one-tenth of 76 cmHg.

The formula is: f= ghs.

kilograms cubic meters.

g = 10 N kg.

h = depth of water.

1. The reason for the pressure inside the liquid:

The liquid is subjected to gravity and is fluid, so the liquid has pressure inward in all directions.

2. The pressure of the same liquid is equal in all directions at the same depth.

3. The internal pressure of the same liquid, the deeper the depth, the greater the pressure.

4. When the depth is the same, the greater the density of the liquid, the greater the internal pressure of the liquid.

The pressure of 1m water is.

Because 1 standard atmosphere is 760 mmHg and 76 cmHg is 10 meters of water, 1 meter of water is equal to one-tenth of 76 cmHg.

The formula is: f= ghs.

kilograms cubic meters.

g = 10 N kg.

h = depth of water.

The atmospheric pressure at 30 meters below the surface of the sea is 4 bar.

The ratio of the pressure experienced by the object to the area subjected to the pressure is called the pressure, and the symbol is p. Stress is used to compare the effects of pressure. The greater the pressure, the more obvious the effect of the pressure, and the formula for calculating the pressure is:

p f s, the unit of pressure is pascal (abbreviated pa), and the symbol is pa.

The methods of increasing pressure are: increasing the pressure when the force area is constant or decreasing the force area when the pressure is constant, and the methods of reducing the pressure are: constant pressure reduction or constant pressure boosting.

The definition refers to the pressure of water. When water is used in a container, the water is subjected to gravity, and the pressure equivalent to that weight is applied to the walls and bottom of the container. The water contained in the container has a pressure effect on the side and bottom surface, and the pressure is always perpendicular to the contact surface for any direction.

And when the depth is the same, the pressure is also the same; The deeper the liquid, the greater the pressure. For example, if you add a thin plastic sheet to one end of a glass tube that is open at both ends, the opening end is upwards and you will not fall when you put it straight into the water. This is because there is an upward force of water (i.e., upward pressure).

The water is then slowly poured into the glass tube so that the plastic sheet does not fall off when the water inside the tube is not close to the water outside the tube. This proves that the water has an upward pressure, giving the flakes a supporting force. Continue to add water until the water surface inside and outside the pipe is equal, and the downward pressure of the water column in the pipe is equal to the upward pressure on the outer sheet of the pipe, which falls due to the weight of the plastic sheet itself.

At this time, the downward pressure of the sheet at the bottom of the cylinder is the weight of the water column in the cylinder, and the upward pressure is the weight of the water excluded by the cylinder. The same is true if the glass tube is placed at an angle. That is, the pressure of the water is upward, and there is pressure on all sides.

Basic parameters. Generally, the water pressure of tap water is about kilograms, and 1MPa is equal to 10 kilograms of water pressure. 1MPa = 10kg square centimeter, MPa megapascals is the new unit. In accordance with the water supply code:

Faucet water, generally considered meters, the national regulation of the end of the pipe network pressure is, more intuitively, is equivalent to a standard atmospheric pressure, the end of the pipe network pressure is, equivalent to the faucet from the water supply tower (pool) has a height of 14 meters. Therefore, the higher the location of the home, the lower the water pressure.

1.Water pressure has nothing to do with the amount of water, only with the depth and density of the water. (The deeper the water, the greater the water pressure; The higher the density, the greater the water pressure), in real life, the water pressure at home is also affected by the bending degree of the water pipe, and the more times the bend, the water pressure will decrease.

2.The deeper the water, the greater the water pressure.

3.At the same depth, the water pressure is under pressure on all sides.

Calculation formula. P= GH (P is the pressure, is the density of the liquid, the density of water is 1 10 3kg m 3, g is the gravitational acceleration take n kg, h is the height from the pressure point to the liquid level).

Water pressure: An architectural term that refers to the normal effect of water on the surface of buildings and structures that water comes into contact with when it is stationary or flowing. A force that acts perpendicular to its interface and points towards the surface of action, where the interface can be a split interface between two parts of the liquid or a contact surface of a liquid with a solid or gas.

The pressure per unit area is called pressure.

The force of water or other liquid acting perpendicular to its interface and pointing towards the surface of action. An interface can be an interface between two parts of a liquid, or it can be a contact surface between a liquid and a solid or gas. The pressure per unit area is called pressure.

According to the static or flowing liquid, it is divided into hydrostatic pressure and hydrodynamic pressure. In hydraulics and engineering, pressure is also referred to as pressure.

Type: Hydrostatic pressure.

It is characterized by the fact that the pressure on each surface with different orientations is equal to each other through a point. The hydrostatic pressure is a scalar function of the coordinates of the spatial point. In a homogeneous still liquid under gravity, the pressure at any point is p=p0+ h.

where p0 is the liquid surface pressure, h is the depth of the point below the liquid surface, is the bulk density of the liquid, and h is the weight of the liquid column per unit area from the point to the liquid level. The sum of the position height z of any point in a stationary liquid with respect to a certain horizontal datum and the pressure height of that point is equal to the same constant, = constant. If there is an increase or decrease in the pressure acting on the boundary of a stationary liquid, the pressure at any point inside the liquid will increase or decrease by the same magnitude in any direction.

This is Pascal's law of hydrostatic pressure transfer.

"Pressure is the pressure per square meter of area (p = f m2), the pressure of the liquid is p = gh, is the density (the density of water is 1), g is the kilogram, h is the depth. More than 1,000 square meters in area, 175 meters deep, filled with water. How much pressure or pressure is there on the bottom surface?

Base pressure p= gh=1*Pascal pressure f=p*m2=....

Categories: Education, Science, >> Learning Aid.

Problem description: The pressure of water on the bottom of the container is generated by gravity, so what is the pressure inside the water? Our teacher said that it was "gravity", but I don't think it would be easy to talk about it, because doesn't it say that the pressure of water at the same height is equal in all directions? So it has pressure in different directions at this point, what does this have to do with gravity?

Also, is there a relationship between liquid pressure and gravity and volume? I think it has a relationship, there is a relationship between mass and gravity, density is related to mass, volume is related, density is related to pressure, then"Equal"Substitution, how does it matter?

Analysis: Liquids and gases are fluid, so that they are under pressure both inside themselves and on the side walls of the container. Fluidity, in turn, is generated by gravity.

It doesn't matter, it just has to do with the depth of the liquid.