Are the liquid levels in the two tanks still the same?

Sealed tank – when was it sealed? Is there pressure in the sealed tank? If the external atmospheric pressure changes, the liquid level should change as well.

It depends on whether there is pressure inside the sealed tank; if there is pressure, it will definitely make a difference. Even a pressure of just a few millimeters of water column can cause a difference in the liquid level.

There is definitely a difference in liquid level; as long as there is pressure and vaporization in the sealed tank, the liquid level will vary.

There are two 8-meter pressure-free tanks, each containing 4 meters of water. One of the tanks has an open top, while the other is sealed. A valve connects the liquid levels at the bottom of these tanks. If the connection valve at the bottom is opened, will the water levels in the two tanks remain the same? ——The pressure resistance of the hermetically sealed storage tanks I’ve seen at normal pressure is 1960 Pa for positive pressures and 490 Pa for negative pressures; this corresponds to gas pressures of less than +200 mmHg and -50 mmHg. (Those with more advanced knowledge are aware that some tanks can withstand positive pressures of several thousand Pa.) This is affected by the saturation pressure of the medium, the amount of air present in the medium, changes in temperature, and changes in the liquid level in the tank. Think about the rest by yourself.

The pressure in a sealed tank is positive; is it higher or lower than the pressure in an open tank?

The pressure in a sealed tank is positive; is it higher or lower than the pressure in an open tank?

An open tank is at atmospheric pressure, while a sealed tank is at positive pressure, which should be higher than atmospheric pressure.

1 Understanding of the problem: A pressure vessel at normal pressure with water as the medium means that it is at room temperature and contains no volatile gases; the vapor pressure resulting from the natural evaporation of water at room temperature is ignored. 2 Assumption 1: Both vessels are open at the time water is poured in and reach the same height; thereafter, the vessel is sealed and its exhaust pathway is closed, with no liquid drawn out from the bottom of either vessel. At this point, the liquid levels in both tanks are the same. Hypothesis 2: Under the same conditions as Hypothesis 1, if air is removed from the bottom of the sealed tank, the liquid level in that tank drops rapidly; a negative pressure is created at the top, after which the drop stops. The liquid level in the open tank then decreases as well. Other......

According to precise calculation methods, the liquid levels in the two tanks must be different; one is sealed while the other is open, so there is a difference in pressure between the two tanks!

1. There are two 8-meter atmospheric pressure tanks, which indicates that both tanks are at atmospheric pressure (even if they are sealed). 2. Each one contains 4 meters of water, which indicates that the liquid level inside the tanks is the same; but is the elevation of the tank bottom the same as well? 3. One of the tanks has an open top, while the other is sealed; they are connected by a valve. If the connection valve at the bottom is opened, the liquid levels in them need not be equal. In case 2, if the elevation levels are different, the opening of the connecting valve will result in a liquid level difference. In case 3, the tank is also affected by the external environmental temperature; as the temperature changes, the pressure inside the sealed tank changes more significantly compared to that in an open tank, which again leads to a liquid level difference ； Just like with the elevation, when the connection valve is opened, the ambient temperature is the same as that in front of the sealed tank; therefore, there should be no difference in liquid level.