Moreover, pressure does not have to be measured along the wall of a container but rather can be measured as the force per unit area along any plane. Air pressure, for example, is a function of the weight of the air pushing down on Earth. Thus, as the altitude increases, pressure decreases.
physical features. The American Bobtail is a powerful and heavy cat with strong bones and muscles. Its medium-length legs complement the torso displaying powerful muscles and strong bones. The tail, which differentiates it from other breeds, is short-being between 2.5 cm to 10 cm (1 inch - 4 inches) in length. The tail should be flexible and can be slightly curled or even 'knotted'. Despite the length, this little tail has a good plume and long, shaggy, thick hair covers the tail.
The northern pintail is named for its long, pointed tail feathers. The female's tail is much shorter than the male's needle-like tail. Males and females have different patterns and coloring. Males have a dark brown head, a white neck and breast, and a grayish back.