One fourth to one half of our daily fluid loss occurs through

Perspiration

Sweating which is also known as Perspiration is the product of liquids discharged by the perspiration glands in the epidermis of humans. Two kinds of perspiration organs can be observed in humans are apocrine glands and eccrine glands. In the human body, the eccrine sweat glands are evenly scattered in different parts.

Sweating is fundamentally a mechanism of thermo-regulation in the human body, which is accomplished by the water-rich movement of the eccrine glands.

perspiration is the answer.