The longitude (abbreviation: Long., Î», or lambda) of a point on the Earth's surface is the angle east or west from a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses (often improperly called great circles), which converge at the north and south poles.
Use the dual thermometers to calculate relative humidity. Fisher Scientific Mason's Hygrometer has one dry thermometer and one wet thermometer which provide temperature readings for determining the relative humidity.
hygrometer A hygrometer UK /haÉªËÉ¡rÉmÉªtÉr/ is an instrument used for measuring the moisture content in the atmosphere. Humidity measurement instruments usuall... hygrometer A hygrometer UK /haÉªËÉ¡rÉmÉªtÉr/ is an instrument used for measuring the moisture content in the atmosphere. Humidity measurement instruments usually rely on measurements of some other quantity such as temperature, pressure, mass or a mechanical or electrical change in a substance as moisture is absorbed.