What color is oxygen in liquid form?

Liquid oxygen is indeed pale blue in color. This distinct coloration is due to the way oxygen behaves at extremely low temperatures, where it transitions from a gas to a liquid. At its boiling point of -183 degrees Celsius (-297 degrees Fahrenheit), oxygen displays this pale blue hue, which is a characteristic feature of the liquid state.

Understanding the properties of gases and their behavior when liquefied is crucial in many medical and industrial applications, particularly in the fields of respiratory therapy and medical gas administration. Other colors, such as colorless or red, do not accurately represent liquid oxygen, as it is not either of these in its liquid state. Similarly, while blue-green could suggest a mixture or a change in state, it does not accurately describe pure liquid oxygen, which maintains the pale blue appearance. Thus, the identification of liquid oxygen as pale blue is essential knowledge for proper handling and administration in medical settings.