A function of the testes is to: make estrogen, produce sperm, deliver sperm to the outside of the body, add fluid to sperm produce sperm When a sperm joins with an egg, it is called: fertilization, premenstrual syndrome, ejaculation, ovulation
A hygrometer is weather instrument used to measure the amount of humidity in the atmosphere. There are two main types of hygrometers â a dry and wet bulb psychrometer and a mechanical hygrometer. Humidity is the amount of water vapor in the atmosphere caused by condensation and evaporation.
Other hygrometers work on the basis of a length of natural fibre, such as hair or a fine strand of gut, changing with variations in humidity. In a dew-point hygrometer, a polished metal mirror gradually cools until a fine mist of water (dew) forms on it. This gives a measure of the dew point, from which the air's relative humidity can be calculated.