The water molecules pack together tighter as pressure increases-the pressure increase with depth, due to the weight of the water above, and causes the greatest density changes in seawater with depth (greater than the density changes due to temperature and salinity changes).eawater Properties that Control Density. Density is defined as the mass of water per unit volume and has units of grams per cubic centimeter (g /cm3), kilograms per liter (kg/ L) or kilograms per cubic meter (kg/m3). The density of fresh water at 4 C is 1.0000 g/cm3 or 1.000 kg/liter or 1000 kg/m3.
Answer Wiki. Swans live for approximately 20 to 30 years. Some variations exist between the more common swan species. The trumpeter swan, which is the largest swan in North America, lives for an average of 24 years in the wild but has been known to live for 33 years in captivity. A mute swan lives for an average of 19 to 20 years; the tundra swan has a similar life span.
The difference is in the coloring of their bills and feet. The English Mute have reddish orange bills and jet black feet. The Polish Mute is a pure white version of the Mute Swan. They have bright orange bills and light buff-colored/ grayish colored feet. Mute Swans produce a clutch of young once a year. Mute Swans typically have between 5-10 eggs and typical brood sizes are from 1-9 cygnets. Incubation is between 30-40 days. Captive male Mute Swans typically weigh between 24-30 pounds with the females weighing approximately 17-23 pounds.