Tag: pressure belts

A wind vane is an instrument that shows the direction of the wind. It is generally located at the highest point of a building. It is also known as a weather clock, as it is used to predict the weather of a particular place. The direction in which the wind is blowing plays a significant role in predicting the weather of that particular place.

The knot is a unit of speed equal to one nautical mile per hour, exactly 1.8 km/h (approximately 1.15 mph)

The term anemometer is derived from a Greek word 'anemos' which means wind. Anemometer is used to measure the speed of the wind. This instrument is used in all weather station. Tha standard height of the anemometer is 10meter in rural areas.

Wind is been defined as air in horizontal motion caused by difference in pressure. There are two type of movement in the atmosphere : horizontal movement and vertical movement. Vertically moving air columns are known as currents. Winds are the means by which uneven distribution of pressure over the globe is balanced out .

Wind is always named by the direction from which they blow. Wind van is the most common type of instrument used to determine wind direction. So to measure wind direction wind van has a freely rotating arm which moves with the wind.

A knot is a unit of speed. It is abbreviated k tot kn. It is used around the world in meteorology and used for maritime and aviation purposes. One knot is the same as one nautical mile per hour. Therefore, one knot is equal to 1.1508 statute miles per hour (1.1508 mph or 1.852 kilometres per hour).

Direction and speed are the two basic wind measurements. Wind is always named by the direction from which it flows. The direction from which a wind blows is called windward side and towards which it blows is called Leeward did. The wind vane is the most common instrument to measure wind direction. The speed or flow velocity is an important atmospheric criterion. Wind generally blows high pressure towards the low-pressure areas due to temperature change. Anemometer is commonly used to measure wind speed.

Wind are always named by the direction from which they blow. For example, a west wind blows from the West to East; a south wind blows from the south towards the north. The wind vane is the most common type instrument used to determine wind direction so it's arrow is always in the direction from which wind is blowing.

A self-recording anemometer (Anemograph) giving a continuous trace of the direction and velocity of the surface wind. In the Dines tube anemograph, the wind pressure acts upon the opening of a tube arranged as a vane to face in the direction of the wind. Pressure is transmitted through the tube to a float carrying a pen, the height of which indicates the wind velocity.

The speed of wind can be measured using a tool called an anemometer. An anemometer looks like a weather vane, but instead of measuring which direction the wind is blowing with pointers, it has four cups so that it can more accurately measure wind speed. When wind pushes into the cups, they rotate the axis.