What is liquid pressure and what is the difference between liquid pressure and pressure

1.The reason why the pressure of the liquid arises is due to the force of gravity on the liquid. If the liquid is weightless, there will be no pressure at all.

2.Due to the fluidity of liquids, the pressure generated by them has the following characteristics.

1) In addition to the pressure on the bottom of the container, the liquid also exerts pressure on the side walls that "restrict" its flow. Solids, on the other hand, only exert pressure on their bearing surfaces, always in a direction perpendicular to the bearing surfaces.

2) There is pressure inside the liquid in all directions, and the pressure is equal in all directions at the same depth.

3) The formula for calculating the pressure of a liquid is p= gh. It can be seen that the pressure of the liquid only depends on the type of liquid (i.e. density) and depth h, and has no direct relationship with the mass and volume of the liquid.

4) The liquid in the closed container can transfer the pressure it is subjected to in all directions according to its original size.

3.The pressure on the bottom of the container is not necessarily equal to the gravity of the liquid. The pressure at the bottom of the container is f=ps=ghs, where "hs" is the volume of the liquid column with a bottom area of s and a height of h, and "ghs" is the gravitational force of this liquid column.

As a result, the pressure on the bottom of the container may be equal to, or greater or less than, the gravitational force of the liquid itself.

The solid is under pressure on the object that supports it due to the force of gravity, and the liquid is also subject to gravity, and it also has pressure on the container of the object that supports it, and this pressure is called liquid pressure.

1.The same liquid, the same depth, is equal in all directions.

2.For the same liquid, the pressure increases with depth.

3.Different liquids, the same depth, the pressure increases with the increase of density.

The pressure on the bottom surface of the container due to the neutralization of the liquid is related to the density and depth of the liquid.

There is pressure inside the liquid in all directions.

The same liquid, the same depth, is equal in all directions.

For the same liquid, the pressure increases with depth.

Different liquids, the same depth, the pressure increases with the increase of density.

Because the liquid is subject to gravity and is fluid.

Therefore, its gravity will be dispersed in all directions, which is manifested as the strong effect of the liquid on the object inside, that is, the pressure of the liquid.

When three identical containers are placed on a horizontal tabletop, the force area is the same. The pressure of the three containers on the table top is equal, according to the formula for calculating the pressure p=f s, they all have the same pressure on the table top (because it is a horizontal tabletop, the pressure on the table is equal to their gravity f=g=mg), according to m=g g, so the mass of the three liquids is equal. If you ask about the pressure of the container on the tabletop, the pressure should be the container plus liquid gravity; If you ask the pressure of the liquid on the bottom of the container, it is just the p=pgh of the liquid.

There is pressure inside the liquid in all directions.

The same liquid, the same depth, is equal in all directions.

For the same liquid, the pressure increases with depth.

Different liquids, the same depth, the pressure increases with the increase of density.

Liquid pressure and pressure are different in terms of definition, cause, unit, calculation method, etc.

1. Differences in definitions.

1. Liquid pressure: In the bottom, inner wall and interior of the liquid container, the pressure generated by the liquid is called liquid pressure, referred to as hydraulic.

2. Pressure: Pressure in physics refers to the force that occurs on the contact surface of two objects, or the vertical force of the gas on the surface of the solid and the liquid, or the vertical force of the liquid on the surface of the solid.

3. In mechanics and most engineering disciplines, the word "pressure" is synonymous with pressure in physics.

2. Differences in causes.

1. Liquid pressure: The liquid is subjected to gravity, and the liquid has fluidity, so the liquid has pressure on the bottom and side wall of the container.

2. Pressure: The pressure on the solid surface is usually the result of elastic deformation, and generally belongs to the contact force. The pressure on the surface of liquids and gases is often the result of gravity and molecular motion.

3. Differences in units.

1. Liquid pressure: SI unit: "Pascal", referred to as "Pa", symbol "Pa".

2. Pressure: SI unit: "Newton", referred to as "ox", symbol "n".

Fourth, the calculation formula is different.

1. Liquid pressure: pressure = pressure pressure area (p=f s) = gh.

2. Pressure: pressure = pressure * force area (f = ps).

The formula for liquid pressure is: p= *g*h ( : represents the density of the liquid, g: represents the acceleration of gravity, h: represents the depth of the liquid).

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.

In junior high school, the principle of liquid pressure can be expressed as follows: "There is pressure inside the liquid in all directions, and the pressure increases with the increase of the depth of the liquid, and the pressure of the same liquid at the same depth is equal in all directions; The pressure produced at the same depth is related to the density of the liquid, the higher the density, the greater the pressure of the liquid. ”

The pressure of a liquid is determined by the density of the liquid and the force of gravity on it. The liquid pressure formula is as follows:

p = gh

where p is the pressure of the liquid (unit: pascal, pa), the density of the liquid (unit: kilogram cubic meter, kg m), and g is the acceleration due to gravity (unit:

m seconds squared, ms ), h denotes the height or depth of the liquid (unit: m, m).

This formula can be derived from the principle of hydrostatics or from Newton's second law in relation to the pressure of a liquid column.

The liquid pressure formula has a wide range of applications in practical life and scientific research. Here are some application examples:

1.Hydraulic system: The pressure formula for liquid fluids is widely used in hydraulic systems. For example, the design and calculation of hydraulic machinery, hydraulic systems, water towers and water pipes.

2.Underwater depth calculation: With the liquid pressure formula, the pressure on an underwater object can be calculated to determine the depth of an underwater object. This is very important in diving, marine scientific research, and engineering design.

3.Fluid mechanics: The pressure formula for liquids is the basis for the study of fluid statics and dynamics. When studying the fluid dynamics of liquids, the surface tension of liquids, etc., the liquid pressure formula is commonly used.

Example Questions:

Problem: A vertical water pipe with a height of 2 meters and a liquid density of 1000 kg at the bottom of the cubic meter. Find out what is the pressure of the liquid at the bottom of the water pipe?

Answer: According to the liquid pressure formula, p = gh. The data for burning coincidences is =1000 kg m, g m s, h = 2 m. Substituting the data into the formula calculates:

p = 1000 kg/m³ ×m/s² ×2 m = 19600 pa

Therefore, the liquid pressure at the bottom of the water pipe is about 19600 Pascals.

Liquids and solids are not the same, liquid pressure.

Formula: p= gh where g= or g=10n kg, the unit of h is m, the unit of h is kg m 3; , the unit of pressure p is pa...

Solid pressure. Formula: p=f s

f is the pressure, s is the pressure area, it must be the actual area.

The formula for calculating the pressure is p=f s, and the liquid pressure p= gh:

1. Definition of pressure: The ratio of the pressure on the object to the area of the force is called pressure.

2. Formula: p = derivation formula: f = ps

3. Unit: the unit of pressure f: Newton (N), the unit of area S: m2 (m2), and the unit of pressure P: Pascal (Pa).

4. Application: reduce pressure. Such as: railway rail sleepers, tank installation tracks, school bag belts are wider, etc.

5. The formula for calculating liquid pressure: p= gh

6. When using this formula to solve the problem, the unit of density is kg m3, and the unit of pressure p is Pascal (pa).

It 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. In this experiment, the density of the water remains the same, but the depth increases repeatedly, the pressure in the lower part increases, and the hydraulic pressure finally exceeds the upper limit of what the barrel can bear, and the barrel cracks.