In commerce, liquid oxygen is classified as an industrial gas and is widely used for industrial and medical purposes. Liquid oxygen is obtained from the oxygen found naturally in air by fractional distillation in a cryogenic air separation plant.
Lesson Summary. An acute angle is any angle smaller than 90 degrees. A right angle is an angle that measures 90 degrees. It doesn't matter how much smaller the angle is than 90 degrees; as long as it's smaller, it's acute. To unlock this lesson you must be a Study.com Member.
A Right triangle contains a 90 degree angle. This can be any of the three angles that make up the triangle. An Acute triangle has an angle that is greater than 0 degrees and less than 90 degrees. An Obtuse triangle is an triangle that contains an angle that is greater than 90 degrees and less than 180 degrees.