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.
Measuring Angles Using Degrees If the minute hand of a clock goes from the 12 noon position all the way to the 12 midnight position it has traveled 360 degrees, denoted as 360 Â° . Special names for angles of certain measure: An Acute angle measures less than 90 degrees. A Right angle measures exactly 90 degrees.