Carbon dioxide. Carbon dioxide (chemical formula CO2) is a colorless gas with a density about 60% higher than that of air (1.225 g/L) that is odorless at normally encountered concentrations. Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms.
You should only do ballet in pregnancy if you are used to it. Ballet stretches can place a lot of pressure on your joints, especially your pelvic joints, and standing on one leg can cause pain in your pelvis.
1 Most airlines allow pregnant women to travel through their eighth month. 2  Traveling during the ninth month is usually allowed if there is permission from your health care provider.raveling by air is considered safe for women while they are pregnant; however, the following ideas might make your trip safer and more comfortable. 1  Most airlines allow pregnant women to travel through their eighth month.