aero-, aer-, aeri-
(Greek: air, mist, wind)
The two primary forces in aerodynamics are lift and drag.
"Lift" refers to, usually upward, forces perpendicular to the direction of motion of an object traveling through the air. For example, airplane wings are designed so that their movement through the air creates an area of low pressure above the wing and an area of high pressure beneath it. The pressure difference produces the lift needed for flight which is typical of "airfoil" design.
"Drag" forces are parallel and opposite to the object's direction of motion and are caused largely by friction.
Large wings can create a significant amount of lift, but they do so at the expense of generating a great deal of drag. Extended "spoilers" on aircraft wings make the the wings capable of high lift even at low speeds, so low landing speeds can still provide enough lift for a gentle "touchdown".
Aeroembolism can accidentally occur during surgery by a hypodermic injection or from a rapid change in pressure, also known as "decompression sickness".
2. Distention of the stomach with gas: When Jane complained of having stomach pains, Dr. Thompson examined her and diagnosed her as having a condition of aerogastria in which bubbles expanded her stomach causing it to be painful.
A gel formed by the dispersion of air in a solidified matrix like a solid foam, as Styrofoam.
Aerogel is a porous solid formed by replacing the liquid of a gel with a gas, such as rigid plastic foam.
A windmill is an example of an aerogenerator by converting mechanical energy into electrical energy.
2. A letter designed for airmail consisting of a single sheet of lightweight paper that, once written on, can be folded and sealed to form an envelope; air letter: Jenny used to use aerograms to send letters to her mother, but now she uses emails instead!
The dated term aerogram can also be described as a wireless message.
At one time, it was a telegram and part of its journey was accomplished by an aeroplane (airplane).
3. A message sent "through the air": It used to be that an aerogram was sent by the way of radio!