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.
Did you know that a duck could live upto 20 years? Yes, that is right. Although domesticated ducks have a relatively less lifespan when compared to their wild counterparts, the former can approximately live for 10 to 15 years. One mallard duck lived for 27 years, making it the highest life span for a duck till date. These lovely birds are generally found in aquatic habitats like wetlands, marshes, ponds, rivers, lakes and even oceans. Winter is the perfect season for ducks to look out for a mate.