[Q&A] May 20, 2017
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Question: What is critical pressure? Answer: The gas and liquid phases of a substance are in equilibrium, and the density of the gas phase is equal to that of the liquid phase. The gas-liquid interface disappears; the state at this point is called the critical state. The pressure at the critical state is called the critical pressure of that substance. http://bbs.hcbbs.com/static/image/hrline/4.gif HaiChuan Network’s special May Day event, “Remembering the Glorious Moments,” warmly invites your participation. http://bbs.hcbbs.com/thread-1774529-1-1.html (Source: HaiChuan Chemical Forum) Summary post for HaiChuan Network’s special May Day event, “Remembering the Glorious Moments.” http://bbs.hcbbs.com/thread-1774532-1-1.html (Source: HaiChuan Chemical Forum) First round of voting for the creative ideas contest (use your mouse to influence the results). http://bbs.hcbbs.com/thread-1776507-1-1.html
Critical pressure refers to the pressure (density) of a substance at its critical state; it is the minimum pressure required to liquefy a gas at the critical temperature, and it is also the saturated vapor pressure of a liquid at that critical temperature. At the critical temperature and critical pressure, the molar volume of a substance is called the critical molar volume, and the state at these temperatures and pressures is referred to as the critical state.
Critical pressure: The pressure at which a substance is in a critical state. This pressure is the saturated vapor pressure of the liquid at its critical temperature.
For the same substance, a higher saturation pressure corresponds to a higher saturation temperature. Increasing the pressure raises the liquefaction temperature, making it easier for the gas to be liquefied; that is, at a certain temperature, it can be liquefied by increasing the pressure. However, for each substance, once the temperature exceeds a certain value, it cannot be liquefied no matter how high the pressure is. This temperature is called the \"critical temperature\" – the highest temperature at which the substance can still be liquefied. The pressure corresponding to the critical temperature is known as the critical pressure.
The pressure (stress) of a substance at its critical state. It is the minimum pressure required to liquefy a gas at the critical temperature. That is, the saturated vapor pressure of a liquid at its critical temperature.
Critical pressure refers to the pressure (density) of a substance at its critical state; it is the minimum pressure required to liquefy a gas at the critical temperature, and it is also the saturated vapor pressure of a liquid at that critical temperature.
For each substance, once the temperature exceeds a certain value, it cannot be liquefied no matter how high the pressure is increased. This temperature is called the “critical temperature”. The critical temperature is the highest temperature at which a substance can be liquefied. The liquefaction pressure corresponding to the critical temperature is called the critical pressure.
For the same substance, a higher saturation pressure corresponds to a higher saturation temperature. Increasing the pressure can raise the liquefaction temperature, making it easier for the gas to liquefy. That is, at a certain temperature, it can be liquefied by increasing the pressure. However, for each substance, once the temperature exceeds a certain value, it cannot be liquefied no matter how high the pressure is increased. This temperature is called the “critical temperature”. The critical temperature is the highest temperature at which a substance can be liquefied. The liquefaction pressure corresponding to the critical temperature is called the critical pressure.
Pressure at the disappearance of the gas-liquid interface
The pressure (stress) of a substance at its critical state. It is the minimum pressure required to liquefy a gas at the critical temperature. That is, the saturated vapor pressure of a liquid at its critical temperature. At the critical temperature and critical pressure, the molar volume of a substance is called the critical molar volume. The state at critical temperature and critical pressure is called the critical state.
The gas and liquid phases of a substance are in equilibrium, with the density of the gas phase being equal to that of the liquid phase. The gas-liquid interface disappears; the state at this point is called the critical state. The pressure at the critical state is called the critical pressure of that substance.