A periodontist is a dentist who specializes in the prevention, diagnosis, and treatment of periodontal disease, and in the placement of dental implants. Periodontists are also experts in the treatment of oral inflammation.
Ground speed. Ground speed is the horizontal speed of an aircraft relative to the ground. An aircraft heading vertically would have a ground speed of zero. Information displayed to passengers through the entertainment system often gives the aircraft ground speed rather than airspeed.
Letâs start with what an unladen swallow is. The simple answer, itâs a bird. The more complicated answer is that itâs a bird with 74 distinct species of swallow. Some found in Africa, others in Europe. What is air speed velocity? Itâs the relative velocity between some object, in this case the swallow, and the air. In order to calculate the airspeed you have to take the difference between ground speed and the wind speed. Ground speed is the speed in which an object moves relative to some reference point on the ground.