Does gasoline evaporate faster when above 60 degrees?
Answer:
Yes, the higher the temperature, the faster the evaporation. If possible, fill your car up at night during the summer. Same with filling up a lawnmower or other yard appliance.
Everything evaporates faster at elevated temperatures. Luckily enough, our gas tanks in our vehicles are closed and shaded from the sun.
Raising the temperature raises the vapor pressure, resulting in more rapid phase change from liquid to gas. So, the answer is yes.
In Oil and Gas operations I've worked on, Mercury is removed from products by a special Adsorption process.
However, any substance will evaporate faster at higher temperature. The more volatile it is, the faster the evaporation rate.
(Gas delivery pumps are temperature compensated..so you don't get screwed in summer nor do you gain in winter).
Anything evaporates faster at any higher temperature.
Also, when you pump the gas, the best time-of-day to do so is the coldest part of the day.
Both to minimize evaporation and to get the densest gasoline through the pump.
If the pump isn't temperature-compensated, and many in the U.S. are not, then the same volume of liquid is actually less product when its temperature is higher, due to bulk expansion/contraction.
The evaporated gas contributes to smog as well. Pump gas when its cold, if you have a chance.
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