The air cell increases in size during incubation at a rate that depends on temperature and humidity as moisture evaporates from the egg. The drawing shows the normal size of an egg's air cell at 7, 14, and 18 days of incubation. Size of the air cell in the egg on the 7th, 14th, and 18th day of incubation.
A specific heat capacity is the amount of energy necessary to increase the temperature of a kilogram of that substance by one kelvin. Molar heat capacity is the amount of energy necessary to raise one mole of substance by one kelvin degree. One mole of a substance is exactly 6.02x10 23 atoms or molecules of that substance.
The ATM is just another way to indicate the water resistance of a watch. I ATM is equivalent to roughly 10 meters. A watch that is rated to 10 ATM is good to a depth of 100 meters , which is approximately 330 feet. Its easy to forget that at sea level you are already at 1 ATM.