2006-08-08 07:41:14 · 13 answers · asked by Anonymous in Science & Mathematics ➔ Physics
Because the partial pressure of hydrocarbon vapor is much higher than the partial pressure of water vapor.
If you don't know what 'partial pressure' is, you need to get your head back into your physics (or p-chem) book.
Doug
2006-08-08 07:49:00 · answer #1 · answered by doug_donaghue 7 · 0⤊ 1⤋
For a liquid to evaporate, individual molecules must obtain enough heat energy to break the bonds of surface tension and leave the liquid to float away as a vapor. Petrol requires far less energy to break its bonds with other petrol molecules than water need to escape from liquid water. Petrol is therefore far more volatile. If instead of adding heat, heat is removed, water molecules will condense and cling together in random groups. If even move heat energy is removed, the water molecules vibrate even less and crystal bonds form called ice. Notice that it is far more difficult to freeze petrol too because of its week bonds.
2006-08-08 08:08:53 · answer #2 · answered by Kes 7 · 0⤊ 0⤋
because petrol has a lower vapor point than water. This is due to the molecular bonding of the petrol vs. the molecular bonding of water. Water has strong hydrogen bonding which means that it requires more energy to break the bond. Of course as temperature rises, the molecular movement increases, weakening the hydrogen bonding, thus turning to steam at higher temperatures.
2006-08-15 18:55:03 · answer #3 · answered by gtn 3 · 0⤊ 0⤋
THE boiling point of petrol is much lower at arround 30-40 centigrades
the boiliing point of water is 100 C
so the evoperation
2006-08-14 00:32:07 · answer #4 · answered by the oracle 1 · 1⤊ 0⤋
petrol has a lower bond energy and a lower boiling point due to the lower bond energy.so it evaporates faster.as a thumb rule all organic liquids will evaporate faster
2006-08-08 07:48:27 · answer #5 · answered by raj 7 · 0⤊ 0⤋
petrol evaporate more easily as compared to water because in water there is hydrogen bonding but no such hydrogen bonding is there in compounds of carbon(petrol) so it evaporates more rapidly(hydrogen bonding are the most powerful bonding in molecules and it increases the boiling point because bonds donot break up easily)
2006-08-14 00:22:01 · answer #6 · answered by Anonymous · 1⤊ 0⤋
Ordinary Temperature
2017-02-23 08:58:01 · answer #7 · answered by Anonymous · 0⤊ 0⤋
the boiling point of petrol is lower than that of water.
2006-08-16 06:54:20 · answer #8 · answered by smritish g 3 · 0⤊ 0⤋
because petrol; has very weak intermolecular forces and weak forces of attraction.....so it evaporates
2015-10-04 18:54:47 · answer #9 · answered by Mahvish 1 · 0⤊ 0⤋
bcoz of less attraction of molecule and less participation of hydrogen bonding . while water has strong hydrogen bonding
2006-08-08 07:56:17 · answer #10 · answered by rabia a 1 · 0⤊ 0⤋