Question

what is critical temperature and what is the value of this in CO2? Explain.

Answer 1

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Read in another languageSupercritical carbon dioxide

Carbon dioxide pressure-temperature phase diagram

Supercritical carbon dioxide (sCO
2) is a fluid state of carbon dioxide where it is held at or above its critical temperature and critical pressure.

Carbon dioxide usually behaves as a gas in airat standard temperature and pressure (STP), or as a solid called dry ice when frozen. If the temperature and pressure are both increased from STP to be at or above the critical pointfor carbon dioxide, it can adopt properties midway between a gas and a liquid. More specifically, it behaves as a supercritical fluidabove its critical temperature (304.25 K, 31.10 °C, 87.98 °F) and critical pressure (72.9 atm, 7.39 MPa, 1,071 psi), expanding to fill its container like a gas but with a densitylike that of a liquid.

Supercritical CO
2 is becoming an important commercial and industrial solvent due to its role in chemical extraction in addition to its low toxicity and environmental impact. The relatively low temperature of the process and the stability of CO
2 also allows most compounds to be extracted with little damage or denaturing. In addition, the solubility of many extracted compounds in CO

Answer 2

Answer:

The temperature of a body is a quantitative

measure ot the degree of hotness or coolness of the body. According to the kinetic theory of gases, it is a measure of the average kinetic energy per molecule of the gas. Temperature difference determines the direction of flow of heat from one body to another or from one part of the body to the other. Its SI unit 1s the kelvin (K).