If a light and a heavy gas are interdiffusing, the light molecules should move into the heavy-gas region faster than the heavy molecules move into the light-gas region, thereby causing the pressure to rise in the heavy-gas region.
There was heavy gas credit card use, which was not tracked with the actual mileage on the car".
Adding heavy gas to light gas reduces the thermal conductivity because the heavy molecules carry less energy and also interfere with the energy transport of the light molecules.
Diatomic nitrogen (N2), a relatively heavy gas, drops off rapidly with height and exists in only trace amounts at 500 km (300 miles) and above.
This result follows from kinetic theory, as explained below, but it can also be seen by noting that the speed of sound is greater in a light gas than in a heavy gas.
The addition of a light gas to a heavy gas therefore does not reduce the viscosity substantially and may in fact increase it because of the small extra momentum carried by the light molecules.
Chemical weapons use in such meteorological conditions maximises their potential impact as the heavy gas can stay close to the ground and penetrate lower levels of buildings where many people were seeking shelter".
Economists have long recommended that Venezuela cease price controls, unify its multiple exchange rates — the local currency is pegged to the U.S. dollar at three different levels — and end its heavy gas subsidies.
"Chemical weapons use in such meteorological conditions maximises their potential impact as the heavy gas can stay close to the ground and penetrate into lower levels of buildings and constructions where many people were seeking shelter," it said.
If the diffusion takes place in a closed vessel, the pressure difference drives the heavy gas into the light-gas region at a faster rate than it would otherwise diffuse, and a steady state is quickly reached in which the number of heavy molecules traveling in one direction equals, on the average, the number of light molecules traveling in the opposite direction.
My parents and my brothers had introduced me, even before the war, to some kitchen chemistry: pouring vinegar on a piece of chalk in a tumbler and watching it fizz; then pouring the heavy gas this produced, like an invisible cataract, over a candle flame, putting it out straightaway.
