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.
Note that an angle measuring exactly 90Â° is not an acute angle. Instead, it's a right angle. When you think of angles, you should think of them as part of the radius of a circle, which is 360Â° in total. An acute angle makes up less than one-quarter of that circle's radiusâagain, less than 90Â°.