temperatuurirõhu

Temperatuurirõhu, also known as atmospheric pressure, is the force per unit area exerted by the weight of air in the atmosphere of Earth. It is typically measured using a barometer. The standard atmosphere (atm) is a unit of pressure defined as 101,325 pascals (Pa), which is equivalent to 760 millimeters of mercury (mmHg) at sea level and 15 degrees Celsius.

Atmospheric pressure varies with altitude, temperature, and humidity. It decreases with increasing altitude due to the reduced mass of air above. It also changes with temperature; pressure increases with temperature because warmer air is less dense. Humidity affects pressure through its impact on air density.

The average atmospheric pressure at sea level is approximately 101.325 kPa (1,013.25 hPa or 1,013.25 millibars). This value is used as a reference for standard atmospheric pressure and is denoted as 1 atm or 1013.25 mbar.

Atmospheric pressure is crucial for various applications, including weather forecasting, aviation, and high-altitude activities. It is also used in meteorology to study weather patterns and predict changes in weather conditions. Understanding and measuring atmospheric pressure are essential for various scientific and practical purposes.