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| Experimental components |
A hose with a rubber membrane, a U-shaped scale tube, and a glass cup. |
| Experimental process | Inject colored liquid into the U-tube of the pressure gauge and make the liquid level on both sides of the U-tube at the same horizontal plane. Then connect the plastic box with a rubber membrane to the U-shaped glass tube through a hose, and check whether the seal at the connection is well sealed. After that, insert the plastic box with a rubber membrane into a glass cup filled with water, and continuously increase the depth of the plastic box sinking, and observe the change in the height difference of the colored liquid at both ends of the U-shaped glass tube. When the plastic box sinks to a certain depth, stop it in the water at that depth, turn it left and right while observing the change in the liquid level of the colored liquid at both ends of the U-shaped glass tube. |
| Experimental phenomena | As the plastic box with a thin film sinks deeper and deeper in water, you can see that the height difference between the liquid levels of colored liquid at both ends of the U-tube is getting larger and larger. When fixing the plastic box at a certain depth in water, turn it left and right, and maintain a constant height difference between the liquid levels of colored liquid at both ends of the U-tube. |
| Experimental conclusion | In water (or any liquid), the deeper it is, the greater the pressure. The pressure is proportional to depth. |
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