I suggest you read the following from the WJM (Western Journal of Medicine). It provides a section on the study of air travel with airline stewardesses.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1306375/
Page 482. Section "Menstrual Disorders in Miscellaneous Conditions".
It appears problems resolve over time, but could be related to the stress of travelling.
Cold air is heavier
The .22 fires a pellet that is larger in size, and heavier. Being heavier, it carries more energy, and will travel a greater distance.
A football with no air is heavier than a football with full air because the air adds buoyancy and makes it lighter.
Yes solvents are heavier than air
Nitrous Oxide is heavier than air.
Yes, argon is heavier than air. Argon has a higher density than air, so it will sink below the air in the atmosphere.
"Heavier than air" refers to airplanes.
One is lighter and the other one is heavier. :D
An airplane is a heavier than air flying craft
Yes, LP gas is heavier than air.
Gas is heavier than oxygen. Cold air is heavir than hot air
An airplane is a heavier than air flying craft