Board Thread:Social and Race Teams Threads/@comment-27048832-20180212173909/@comment-28169398-20180226052053

RR3Germ wrote: Actually the air is less dense when the temps are cooler which leads to quicker speed as the car is not cutting through as much friction in the air so the air is slipperier. Take a watch of James May running the Bugatti Veyron to it's max speed on Top Gear, this explains it very scientifically. Also in the real world it is best to gas your car up in the morning or coolest part of the day bcos you get more gas in your tank...it's a science thing I know everyone wants to debate this one haha (yet again a few Top Gear clips on this to include an 800 mile run in an Audi A6 diesel from London to Edinburgh and back on 1 tank of gas). The stoma of the leaves of trees open at night and this releases the oxygen that has been produced as a result of photosynthesis during the day. They see it most on the back stretch of Le Mans in that section of woods.

The ideal gas law when expressed in terms of molar mass and density is PM=dRT, so d=PM/RT, so as temperature increases, density decreases... It's also an explanation for why liquid versions of gases are so cold, in order to maintain the same density when they are no longer under pressure, their temperature lowers. They reach their boiling point and return to a gaseous state, which reduces the density.