Heating a sealed container filled with water causes changes in the pressure inside the container
Thread Content
Let’s assume for now that the container has infinite strength and will not deform. Under this premise, if a sealed container filled with water is heated, how will the pressure inside the container change?
Then what? What is the relationship between pressure and temperature? Is there a pattern? Just like superheated steam, superheated water?
It’s not that kind of relationship. A confined space filled with liquid, without any space for vaporization, does not follow a temperature-pressure curve relationship. Water expands when heated, causing the pressure to rise rapidly; I don’t understand how to determine the upper limit of this increase.
This post was last edited by lupg on 2016-2-4 at 15:03. 1. Since the volume of the closed container remains constant and it is assumed that the container wall does not expand, the changes in water temperature can only occur within this limited volume. 2. The specific volume of water increases as temperature rises, while it decreases inversely with pressure. As water continuously absorbs heat and its temperature rises, the volume required for the same mass also increases. Since the volume is limited, pressure must be increased in order to maintain that same volume, and this principle holds true consistently. 3. Water reaches a critical state, at which the specific volume of water is equal to that of steam. 4. Since the assumption made by the original poster is that the strength of the container is infinite, the law of thermal expansion of water can be inferred based on its known properties: as water continues to be heated, the pressure increases continuously until it reaches infinity. 5. Regarding the temperature-pressure relationship in this case, it is possible to make predictions using the principle of constant specific volume; that is, by determining the specific volume at the initial pressure and temperature, and then gradually increasing the temperature, the corresponding pressure for each temperature while maintaining the same specific volume can be found, thereby establishing the temperature-pressure relationship. 6. Such an approach violates natural laws; it is unclear whether water’s physical properties remain those we are familiar with once they reach a certain level. Perhaps an oxygen-hydrogen bomb could be created; this is just a joke.