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.
Acute angles come facing all different directions, different degrees, and even different sizes, but the one thing that they all have in common is that they measure less than 90Â°. You can use a protractor to measure the angle to be sure the angle is less than 90Â°.