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.
There's no need to sit at home all nine months of your pregnancy. While there are a few extra precautions involved in traveling while pregnant, it is still considered safe, for the most part.ravel by Bus or Train. Traveling by both bus and train is safe during pregnancy as long as certain precautions are taken. Bus aisles are narrow, so firmly hold onto the backs of seats as you move around. Train aisles tend to be wider, but bathrooms are small, so always hold on firmly to the rails provided.