In order to grasp the concept of molar mass calculations it is important to understand the molar unit. The mole also called mol is the basic unit of measurement in chemistry. By definition, in modern chemistry, one mole represents the number of carbon atoms in exactly 12 grams of carbon 12 isotope.
Fetal development during the first trimester. The most dramatic changes and development for your baby occur during the first trimester. Itâs also during this time that the fetus is the most susceptible to damage from alcohol, drugs, certain medications, and illnesses.
Most doctors do not mind pregnant women flying during their first trimester; it is actually during the third trimester that pregnant women are told not to fly as it could trigger labor. Flying during the first trimester may be unadvisable if it involves too much stress which could harm the baby and the mother. It is also unadvisable if the woman has had a history of miscarriages or ill health. Flying may cause air sickness which pregnant women are particularly vulnerable to.