Signs and symptoms. Eye floaters are suspended in the vitreous humour, the thick fluid or gel that fills the eye. The vitreous humour, or vitreous body, is a jelly-like, transparent substance that fills a majority of the eye. It lies within the vitreous chamber behind the lens, and is one of the four optical components of the eye.
Wind speed is a measurement of the speed of movement of the air, and is typically reported in miles per hour (mph) or kilometers per hour (kph). Reports for maritime and aeronautical operations may use those or knots (nautical miles per hour).
A RAIN GAUGE measures the amount of rain that has fallen over a specific time period. A WIND VANE is an instrument that determines the direction from which the wind is blowing. An ANEMOMETER measures wind speed. The cups catch the wind, turning a dial attached to the instrument. The dial shows the wind speed. A WIND SOCK is a conical textile tube, which resembles a giant sock, designed to indicate wind direction and relative wind speed. WEATHER MAPS indicate atmospheric conditions above a large portion of the Earthâs surface. Meteorologists use weather maps to forecast the weather. A HYGROMETER measures the water vapor content of air or the humidity. A WEATHER BALLOON measures weather conditions higher up in the atmosphere.