The highest temperature a substance can exist as _ is called its critical temperature.
Correct answer: B. Liquid.
- A. Solid.
- B. Liquid.
- C. Gas
- D. Isotope
Explanation
In thermodynamics, in the PV diagram, if liquid and vapor are present in equilibrium at a point, we call it a critical point. So, a substance can exist in its liquid state before.
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About Real and Ideal Gases
An ideal gas is modelled as particles with negligible volume and no intermolecular attraction, obeying Boyle's, Charles's and Avogadro's laws through PV = nRT. Real gases deviate from this behaviour, especially at high pressure and low temperature, because particle volume and attractive forces matter; the van der Waals equation explains these corrections.
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