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.
Math Open Reference. Search >. data-ad-format=horizontal>. About these. ADVERTISEMENTS. Acute. In math, the word 'acute' refers to an angle less than 90Â°, or to a shape involving angles less than 90Â°. It is the opposite of obtuse, which refers to an angle greater than 90Â°. 1.Acute angle. Any angle with a measure less than 90Â°, for example: For more on this see Acute angle definition. 2. Acute triangle