Hydrostatic pressure gauge

Main purpose: To observe the static characteristics of fluids, learn a method for measuring fluid density, demonstrate and verify basic equations related to hydrostatics.
Main configuration: Experimental function:
This experimental platform can observe:
1. Measure the pressure at any point in still water;
2. Measure the specific gravity of another liquid;
3. Require proficiency in the pressure measurement principles of U-shaped and connected pipes, as well as the ability to analyze problems using the concept of isobaric surfaces.
Equipment configuration:
The main container of the experimental body, pressurized water tank, pressure measuring tube, sealable organic glass water tank, pressure regulator, exhaust valve, drain valve, various pressure measuring tube groups, experimental body bracket, measuring cup (250mL), etc.
Design parameters:
Dimensions: 600 × 200 × 800mm Material: Organic glass


DB-589 Hydrostatic Pressure Gauge Guide

Hydrostatic Pressure Characteristics Experiment
1、 Demonstration purpose
1. Deepen the understanding of the basic equations of statics and the concept of isobaric surfaces.
2. Understand the surface pressure of a stationary liquid in a closed container and the pressure at a certain point inside the liquid.
3. Observe the phenomenon of pressure transmission.
2、 Demonstration principle
When applying pressure to the liquid surface of a sealed container, set the pressure to P0, i.e. P0>Pa. From the U-shaped tube, it can be seen that a pressure difference is generated. On the side of the U-shaped tube that is connected to the upper part of the sealed container, the liquid level drops, while on the side that is connected to the atmosphere, the liquid level rises. From this, it can be inferred that the surface pressure at which the liquid level drops is the surface pressure P0 of the liquid inside the sealed container, i.e. P0=Pa+ρ gh, where h is the height at which the liquid level in the U-shaped tube rises. When the pressure P0 inside the sealed container decreases, the liquid level inside the U-shaped tube shows the opposite phenomenon, that is, P0<Pa, at which point the liquid level pressure P0 inside the sealed container is equal to Pa - ρ gh. H is the height at which the liquid level drops.


3、 Demonstration steps
If the liquid surface of a closed container is pressurized, the pressure inside the container is transmitted in all directions. In the pressure measuring tube on the right, it can be seen that due to the different submergence depths h of points A, B, and B inside the container, the pressure is transmitted to points A first and then to point B. In the pressure measuring tube, it is reflected that the liquid column of tube A rises first while the liquid column of tube B lags behind and also rises. When the pressure is stopped, points A and B are on the same horizontal plane.
1. Close the exhaust valve and slowly apply pressure with a pressure regulator. There is a pressure difference in the U-shaped tube. While applying pressure, observe the rise of the liquid column in the A and B tubes on the right side.
2. Open the exhaust valve to restore the liquid level to the same level, close the exhaust valve, open the water valve at the bottom of the sealed container, release some water, and cause a decrease in pressure inside the container.
4、 Discussion
Why is P0 the gauge pressure and vacuum value?
2. Can this device measure the severity of other liquids? Why?