Water pressure transfer problem, what is the speed at which water pressure is transferred

To give you two explanations, I hope you can understand one of them.

1. Because the table is not in contact with water, the pressure on the table is equal to the total gravity between the container and the water, and the pressure transmitted by the water is pressed on the bottom of the container and does not act on the table.

2. Because the container and the water constitute a system, the water transmits pressure inside the system and does not affect the outside of the system.

Water pressure is only the pressure inside the water, which is in direct contact with the bottom of the container, but not with the tabletop, and the pressure is the contact force (the force generated by objects in contact with each other, and the opposite is the field force, such as gravity), so there is no interaction pressure with the tabletop, so when the pressure on the table is calculated, it is the gravity of the water plus the gravity of the container, and the water pressure cannot be used.

The problem is like a wide-mouth container and a narrow-mouth container (of equal mass), which hold the same amount of water, and balance it on a scale. If the pressure on the table top was water pressure plus the weight of the container, then the perpetual motion machine would have appeared long ago.

In fact, the increase of this pressure from a microscopic point of view is due to the force of the side wall on the water has a downward component, according to the vertical direction of the water balance, the total force of the bottom of the bottle on the water also increases, but on the other hand, according to the theorem of the reaction force, the force of the water on the side wall is upward, this force is like lifting the bottle up, note that I use two words, this force is the internal force, it is actually impossible to lift the bottle up.

You don't need to think about it so much now in junior high school, the two upstairs explained clearly enough, the force inside the bottle is unwilling to affect the force and movement on the outside of the bottle.

Yes, the bottom of the bottle is under downward pressure exerted by the water, or the bottom of the bottle has an upward support force for the water. The reason why you think that the support force of the bottom of the bottle for water is greater than the gravity of the water itself and you come to the conclusion that the two forces are unbalanced is that the water has a third force in addition to the above two forces. Because the walls of the bottle are not vertical, the water is also subjected to downward pressure on the concave part of the wall – or upward pressure on this part of the wall.

So it can be said that the resting state of water is the result of the balance of the three forces. Here the analysis of the bottom of the bottle is the balance of 4 forces (water pressure, table pressure, the gravity of the bottom of the bottle itself, and the upward pull of the wall on the bottom of the bottle).

Your own statements are contradictory, you have made it very clear that liquids transmit pressure, not pressure. And the pressure on the desktop?

I'm entangled in looking at your question.

Pressure is the gravitational force per unit volume of water. Pressure is the force acting on an object. The force of water on the container is only its own gravity.

It's just that the gravity of the water breaks down the container, and then the force of gravity equal to the gravity of the water is synthesized for the container. That is, the pressure of the container on the desktop.

The equivalent of the gravity of water + the gravity of the container is nothing more than a force that is decomposed, transferred, and then merged.

Equal to the speed of sound in water?

When an atomic bomb is in water**, its pressure travels faster.

It is equal to the speed of sound in water and is related to temperature.

It is the speed at which the pressure wave propagates.

In hydraulics there should be a description.

1. The cause of buoyancy. It is because the water pressure on the upper and lower surfaces is different. And what I want to ask is, why?

The buoyancy is indeed caused by the difference in water pressure on the upper and lower surfaces, because the pressure below is greater than the above, and the upward buoyancy will be generated after interaction.

2. Why is there water pressure, which is proportional to depth, and if it is generated by gravity, why is the direction of water pressure facing upward? Or perpendicular vs. surface.

The presence of water pressure can be understood as the result of the impact of water molecules, whose direction is perpendicular to the surface of the object from a macroscopic point of view. Proportional to the depth of the water is because of the action of gravity, in the deeper part of the water, the water molecule is subject to greater gravitational force, so its motion potential energy is larger, which can be understood as its "impact" is more violent, which is why the water pressure is proportional to the depth of the water, and the water pressure below is greater than the above, and there is no countervailing reason.

The water pressure on an underwater object is actually the gravity of the part of the water directly above the object that is pressed on the object, and the water pressure is not necessarily upward, it is in all directions.

Although you don't speak well, I still have to explain it to you.

Liquid itself has fluidity, physics students know that solids can transmit pressure, liquids can transmit pressure, it is precisely because of the fluidity of the liquid that it can transmit pressure in any direction, the force on the surface of the object is actually in all directions, but for the convenience of research, we stipulate that it is perpendicular to the surface, and the resultant force of all forces is actually perpendicular to the surface.

To put it simply, the water below is pressed by the water above, and the interaction between the molecules is strong; In addition, the pressure generated by the water is in all directions, which is reflected in the fact that the objects in the water are perpendicular to the contact surface, but in fact the water is downward, forward, backward. There is also pressure, but it is not reflected in the intuitive object; The different pressures on the top and bottom of the object naturally produce buoyancy

Hope it helps

The pressure of the water. When water is used in a container, the pressure equivalent to that weight of the water acts on 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.

The deeper the heavier, so it is proportional to the depth.

An object floating on the surface of a fluid or submerged in a fluid is subjected to the upward resultant force of hydrostatic pressure in all directions. Its magnitude is equal to the gravitational force of the fluid being dislodged by the object. This is called buoyancy.

According to the balance of the force of the object, when solid A is subjected to force F, there is a tendency to move, and then the object B in contact with it may hinder its movement, and there will be mutual force between them, and this solid A is subjected to mutual force Fa and F are equal in size and opposite in direction, so solid A can be balanced, and object B is subjected to mutual force Fb and Fa are action and reaction forces, so Fb and F are equal in size and in the same direction, This is equivalent to the solid transferring the force f to the object b. Here the solid transmits the pressure, and the force is the vector, which transmits not only the magnitude of the force f, but also the direction of its force. And it has nothing to do with the pressure at both ends, if the force area at both ends is equal, the pressure is also equal, but in most cases, the force area at both ends is not equal, so the pressure at both ends is not equal.

There are three types of pressure transmission: solid pressure, liquid pressure, and gas pressure. You should be asking if the pressure of the liquid is transmitted.

The pressure of the liquid is the force acting on the unit area, which is the pressure, and the pressure of the liquid is the pressure of the liquid.

Seal the liquid in the container, and add a pressure to the liquid in a certain position and direction, and the liquid will transfer the pressure to all directions and positions of the container without changing the pressure (regardless of the influence of the depth of the liquid).

If a piston is added to the position in either direction, the pressure transmitted is obtained, and the pressure transmission is the solid one, and has nothing to do with the pressure at both ends, if the force area at the two ends is not equal, the pressure at the two ends is not equal.

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Pressure sensor usage: Put the pressure sensor on the pressure side, and use the host computer to read the pressure sensor. There are two kinds of data that are sent back, 1 is an analog signal and 2 is a data signal.

Pressure sensor is the most commonly used sensor in industrial practice, which is widely used in various industrial automatic control environments, involving water conservancy and hydropower, railway transportation, and intelligence.

You mean it affects the reaction speed of something? The amount of water pressure has an impact on the flow rate, and of course affects the reaction speed of the equipment that uses the water pressure in the future.

The pressure Qikai is the pressure on each unit surface, which is the same depth inside the liquid, and does not contain several changes. And it can be passed in all directions.

The pressure is related to the area, and the pressure is different depending on the area. It's not that the pressure can't be transmitted, but that the pressure on the side of the talk is different in different areas.

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As much as possible, the pressure is passed on, and the employee makes a detailed plan based on the work that is broken down to him/herself, proposes the main tasks and achievement standards for the current period, and repeatedly communicates with the management about these tasks and standards. Communication is basically bottom-up, then top-down, usually up and down bargaining, and finally consensus through discussion. Communication is also about making employees feel that they have a strong public commitment to what is in the performance plan, so that they are more inclined to stick to those commitments and live up to their performance plan

Effective performance communication is the guarantee of the smooth progress of the performance plan, managers and employees communicate in a relatively equal relationship, the two sides make decisions together, rather than making decisions on behalf of employees, give more play to the initiative of employees, listen to the opinions of employees more, so that employees can actively participate in and accept work tasks, the deeper the degree of employee participation, the easier it is for the performance plan to succeed. Performance coaching. The main job of managers is to coach and help employees improve their performance operation ability and achieve performance goals.

In the process of achieving the goals of employees, managers should guide and supervise the work of employees, solve the problems found in a timely manner, and adjust the performance objectives according to the actual situation at any time. Managers and employees jointly formulate a performance plan through communication, but it does not mean that the subsequent performance implementation process will be smooth sailing, the performance coaching stage is the longest time in the whole performance management, it is an important link to connect the performance plan and performance appraisal. It requires constant and effective communication between managers and employees.

Due to the changeable working environment, the work of employees has become complex, it is difficult to foresee all the difficulties and obstacles when formulating a performance plan, effective communication can allow employees to ask for help and solutions when they encounter obstacles in the progress of work, in addition, employees want to be concerned by superiors when making achievements, and get timely recognition from superiors; At the same time, the superior needs to grasp the progress of the work in time in the process of completing the plan, and correct the deviation between the employee's work and the target plan in time.