Wind is caused by a pressure difference in the atmosphere, resulting in air moving from an area of high pressure to low pressure. The air movement is felt as wind. Pressure differences are caused by areas in the atmosphe... More » Science Earth Science

The northeast trade winds are prevailing winds in the Northern Hemisphere at approximately 30 degrees latitude, which have the ability to quickly propel a ship across the ocean. In the Southern Hemisphere, at 30 degrees ... More »

The harmattan winds blow across the Sahara to the Gulf of Guinea and the Cape Verde Islands. The winds are very dry and dusty. This dryness makes fires more likely in harmattan season and can aggravate health conditions. More »

Typhoons form in the tropical oceans when areas of high pressure rush toward areas of low pressure, which creates wind. When the storm begins to rotate and organize around an "eye" of low pressure, it is well on its way ... More »

A thermal expansion valve in refrigeration or air conditioning systems uses a temperature sensing bulb to open a valve, allowing liquefied refrigerant to move from the high pressure side of the system to the low pressure... More »

Bulk flow is a movement of molecules from an area of high pressure to an area of low pressure. In cell biology, it refers to the transport of fluids or electrolytes between cells through openings, or pores, between the c... More »

The two units of air pressure used in meteorology are low pressure and high pressure. These two units of barometric pressure have a large influence with the weather on Earth. More »