New electrochemical processes are being developed to help CPI companies… CHEMENTATOR + Show - Hide More Using a vast collection of experimental distillation-column data, sieve tray… IN THE NEWS NEWSFRONTS Electrochemistry Spreads its Wings Since 2007, Chemical Engineering has bestowed an annual scholarship to… COVER STORY Sieve Tray Stability Factor Based on Efficiency Data Using a graph of isotherms for a gas of interest (e.g., #'CO'_2#), choosing a temperature below the critical temperature for that gas, and then looking in the high pressure region, you can identify a good Temperature / Pressure combo.× COMMENTARY 2021 Nicholas Chopey Scholarship Note that if the temperature and pressure conditions are such that gas can liquefy, we call the gas vapor. Thus, a low temperature/high pressure combination will be required to liquefy a gas. Similarly, low pressures result in greater distances between the molecules, while higher pressures will result in shorter distances. However, if the temperature is low enough, the molecules will also be moving slow enough for the intermolecular forces of attraction to liquefy. If the temperature is too high, the molecules will be moving too quickly to allow the intermolecular forces of attraction to form the required gas #rightleftharpoons#liquid equilibrium. Instead, there must be some constraints on both temperature and pressure. Neither keeping a fixed temperature and only changing pressure, nor keeping a fixed pressure and only changing temperature will work. This process requires varying temperature and pressure at the same time.

Vapor and liquid exist in equilibrium (vapor #rightleftharpoons#liquid).

Three steps are required for liquefaction: Ideal gases do not get converted into liquid form. So, when a gas turns into a liquid, it's called condensation.

So there is a lower density in the gaseous form and a higher density in liquid form. When turning gas into liquid, the distance between gas molecules is large compared to the distance between liquid molecules. Anytime a substance (solid or gas) is turned into a liquid, the process is called liquefaction.

Liquify vs liquefy