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.
In any triangle, two of the interior angles are always acute (less than 90 degrees) , so there are three possibilities for the third angle: 1  Less than 90Â° - all three angles are acute and so the triangle is acute. 2  Exactly 90Â° - it is a right triangle.