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.
2 Â©2005abcteach.com Types of Angles! A right angle: Right angles ALWAYS measure 90 degrees and look like a perfect corner. A straight angle: Straight angles ALWAYS measure 180 degrees and are a straight line. An acute angle. Acute angles ALWAYS measure less than 90 degrees.