Physical What is the difference between pressure and pressure?

Pressure is the pressure per unit area and is commonly used in the property analysis of gases and liquids.

Pressure is the force of one object acting on another object, in the direction perpendicular to the contact surface

Pressure is the effect of the pressure The focus is on the word effect.

Pressure is force Pressure is: the effect of pressure. p=f/s

Pressure is the force Pressure is the pressure area under force.

Of course, it is the pressure generated by the "mass" of the object. If the atmospheric pressure is strong, then in a vacuum without air, there is no friction?

The force on the unit area of an object is called pressure, which is often customarily called "pressure" in engineering technology, expressed in p, and the unit is pa (pa), where the pressure (pa) expressed by absolute vacuum (zero pressure) as the benchmark is called absolute pressure; The pressure (pg) expressed in terms of actual atmospheric pressure is called gauge pressure; The pressure (ps), expressed in reference to standard atmospheric pressure, is called the sealing pressure; The gauge pressure (also called vacuum) when it is less than the actual atmospheric pressure is called negative pressure.

The International System of Units (SI) uses Pascal as the universal unit of pressure, expressed in Pa or Pa. For example, when the force used for an area of 1 m2 (square meter) is 1 n (Newton), it is 1 pa (Pascal), which is expressed by the following formula:

pa=n/m2

Tips: Unit conversion of pressure and pressure: 1 bar (bar) = 105 Pa, 1 Pa = 1n S2 (Newtons per square meter), 1 standard atmosphere = ; 1mmHg (millimeter mercury column) = .

1. Different meanings:

Pressure is a physical quantity that describes the effect of pressure, and it is related to both pressure and force area.

2. Form a difference:

Pressure is generated by the interaction between objects and objects, and it is present on the contact surface of two objects subjected to force. Pressure has not only magnitude but also direction, and its direction is the same as that of pressure.

3. The units are different:

When applying the formula p=f s to solve the problem, the following points should be noted: the force area s must be the part of the area under pressure, and p is the pressure on the area s; The unit of F is Newton, the unit of S is square meter, and the unit of P is Pascal.

For pressure points:

When the force area is constant, the pressure increases with the increase of pressure. (The pressure is proportional to the pressure).

If the same pressure acts on the surface of the support, if the force area is different, the pressure generated is also different. The stress area is small, and the pressure is strong; When the force area is large, the pressure is small.

Pressure and pressure are two completely different concepts: pressure is the force exerted on the support surface and perpendicular to the support surface, regardless of the area of the support surface and the size of the force area.

Answer: (1) The concept is different: pressure is the force acting perpendicular to the surface of an object, which is generated by the compression of the bearing surface; Pressure is the pressure exerted on a unit area of an object, and it is a physical quantity that represents the effect of pressure.

2) The units are different: In international units, the unit of pressure is Newton (n) and the unit of pressure is Pascal (Pa) 3) From the pressure formula p f s, it can be seen that the pressure is not only related to the magnitude of the pressure, but also to the size of the force area When the pressure is constant, the pressure is inversely proportional to the force area; When the force area is constant, the pressure is proportional to the pressure. It should not be assumed that "the greater the pressure, the greater the pressure", and in the same way, if the pressure is strong, the pressure is not necessarily great.

In short, the pressure strength is determined by the pressure and the force area.

Pressure is the magnitude of the force experienced per unit area, the unit is Pascal, and the unit of force is Newton. Pressure = Force Area. (standard units).

The applied force (i.e., pressure) divided by the area of action of the force is equal to the pressure.

The physical meaning of pressure is to denote the pressure exerted on a unit area。In physics, the force that presses perpendicular to an object is called pressure. The direction of the pressure is perpendicular to the contact surface.

In physics, the force exerted on an object per unit area is called pressure. The unit is Pascal, referred to as Pa, 1Pa=1n Physical meaning means that the pressure on this object per square meter is more than 1N, which is the physical meaning of pressure.

The concept of pressurePressure defines the pressure exerted on a unit area of an object. The physical meaning of pressure is used to denote the physical quantity of the effect of pressure action. The unit of pressure is SI:

Pascal (PA) 1Pa = 1N m21Pa is about the same as the pressure on the table when a newspaper is tiled. Commonly used units are KPA, MPK1MPK=103KPA=106PA.

1. Significance: A physical quantity that represents the effect of pressure.

2. The ratio of the size of the pressure on the object to the area of the force is called pressure, and the pressure is used to compare the effect of pressure, the greater the pressure, the more obvious the effect of pressure. The formula for calculating pressure is: p=f s, the unit of pressure is pascal (abbreviated as pa), and the symbol is pa.

3. The methods of increasing the pressure are: increasing the pressure under the condition that the force area remains unchanged or decreasing the force area under the condition that the pressure is not the same. The methods of reducing the pressure are: reducing the pressure under the condition that the force area remains the same or increasing the force area when the pressure is not the same.

4. The liquid has pressure on the side wall and bottom of the container, and the pressure increases with the increase of the depth of the liquid.

The relationship between pressure and pressure is as follows: pressure is the force of all vertical action on the bearing surface, and pressure is the pressure per unit area; The pressure is not related to the force area, and the pressure is related to the force area, the pressure is used to compare the effect of pressure, the greater the pressure, the more obvious the effect of pressure.

1. Pressure 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 liquid, or the vertical force of the liquid on the surface of the solid, and the pressure refers to the ratio of the pressure on the object to the area of the force. It is not pressure but pressure that measures the effect of pressure; The unit of pressure is Newton, and the unit of pressure is Pascal.

2. The pressure is represented by f; The pressure is denoted by p. The SI unit of pressure is "Newton", abbreviated as "Ox", with the symbol "N", and the unit of pressure is Pascal (abbreviated as Pa) with the symbol Pa.

3. The calculation formula is different: pressure = pressure * force area (f = ps); Pressure = Pressure Area of compression (p=f s). Erect gods.

4. The pressure of the liquid refers to the vertical action of the liquid on the unit area, which is often expressed by P. Pressure is the same as the concept of pressure and is synonymous with pressure and is called pressure in physics; It becomes pressure in hydraulics and pneumatics. The pressure of a liquid refers to the perpendicular force exerted on a unit area of the liquid, which is often expressed by p.