Hobbies And Interests
Air Temperature
The thermometer is perhaps the most commonly used weather instrument. There are two types of thermometer: the liquid-in-glass type and one that incorporates a bimetallic strip that winds and unwinds during temperature changes, using a pointer over a circular scale. Thermometers used for home observations can be read in Celsius (centigrade) or Fahrenheit, and sometimes both. Thermometers should be placed out of direct sunlight so only the air temperature is measured.
Rain Gauge
A rain gauge collects and measures rain and snowfall. Any cylindrical container, including an empty tin can set out in the open, can be utilized as a simple rain gauge. Digital rain gauges also are available. To use a rain gauge most accurately, place it in an open space at least 15 to 30 feet from nearby buildings and structures.
Air Pressure
A barometer is a simple weather instrument that measures atmospheric pressure. Readings vary, depending on the height of the barometer and its elevation above sea level. You can make a simple barometer to view air pressure changes using an empty glass jar with a balloon stretched over the mouth of the jar. The balloon expands and contracts as air pressure changes. Barometric pressure changes are associated with weather changes, so barometers are useful in predicting changing weather.
Wind
A weather vane is a centuries-old weather instrument used to indicate wind direction. Changes in wind direction are associated with weather changes. A way to see wind direction that predates weather vanes is to note the direction and speed of movement of smoke from a fire or chimney. An anemometer is a more modern instrument used to measure wind direction and speed. For accurate readings, an anemometer is best situated above building height and a good distance away from a building. An anemometer is also known as a wind meter or a ventimeter. Air enters the bottom of a tube and pushes a disc up the tube, which is marked for measurements.