## jkasdhk 2 years ago How increasing the pressure on a gas can sometimes cause it to liquify?

1. jkasdhk

@Zaara

2. jkasdhk

is it the answer? Pressure causes the molecules to smunch together. Likewise, reducing pressure on a liquid will cause the molecules to spread out, turning it to gas

3. Zaara

say u have gas in a container, the molecules inside will be moving randomly exerting pressure on the wall of the container. nw when u increase the pressure that means when reducing its volume, the molecules inside will come very closer to each other so that the inter molecular attraction of molecules will be higher... this will lead the molecules to combine together to form liquid... that is the gas will be liquefied.

4. Zaara

ur second statement is nt practically correct... liquid becoming gas depends on temperature....

5. jerry_5594

NO, IT STILL DEPENDS ON THE PRESSURE. IT HAS NOTHING TO DO WITH THE TEMPERATURE

6. jkasdhk

alright.. I got it! Thanks a lot! :)

7. Zaara

@jerry_5594 how do u reduce pressure in liquid????? when temperature increases the molecules move faster breaking their bonds and try to escape as gas... liquid becomes gas this way.......

8. jerry_5594

BY PUTTING A LOT OF AIR PRESSURE ON IT.

9. jkasdhk

putting pressure on liquid will not make it gas... putting pressure on gas will make it liquid.

10. Zaara

@jerry_5594 not so... that will even compress more not gonna be converted into gas :)

11. jerry_5594

IF THERES ENOUGH PRESSURE IT WILL TURN IN TO A LIQUID

12. jkasdhk

ok @zaara this happens when the temp of gas is below critical temp. Above Tc no amount of pressure will liquify the gas.. Why?

13. jkasdhk

?

14. Zaara

Gases can't be liquefied at temperatures above the critical temperature because at this point the properties of gases and liquids become the same, and there is no basis on which to distinguish between gases and liquids. The vapor pressure of a liquid at the critical temperature is called the critical pressure (Pc). The vapor pressure of a liquid never gets larger than this critical pressure.

15. jkasdhk

and K.E. also is very high at Tc ... Right?

16. Zaara

yeah! u got it!!