1 The largest school district by enrollment with an election in 2016 is Wake County Public School System with 153,534 K-12 students.  The smallest North Carolina school district among the nation's largest with an election in 2016 is Duplin County Schools with 9,628 K-12 students.
Freon only remains a liquid while under pressure inside your refrigerator's cooling system. The chemical changes to a gas as soon as it contacts the air. This means, when you smell freon in and around your refrigerator, you're also inhaling varying amounts of freon gas. According to the Environmental Protection Agency, freon gas is denser than air and travels very slowly to the upper atmosphere.
Helium is lighter than air. Youâll usually hear the phrase, âhelium is lighter than air,â but thatâs not entirely accurate. Itâs actually more appropriate to say that helium is less dense than air. Thatâs because helium molecules are not packed together as densely as air molecules are. It is this simple reason that helium balloons float in the air. Itâs also the key to understanding why helium balloons deflate faster in cold air. Answer: They donât. Yes, itâs true that your helium balloon may have shriveled up and is now resting on the cold floor instead of floating in the air.