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Standard atmospheric pressure, often referred to as standard pressure, is a reference pressure defined by the International Organization for Standardization (ISO) as 101325 pascals (Pa). It is commonly used as a reference point for various scientific and engineering calculations. The term "standard pressure" is often used interchangeably with "standard atmosphere" or "atmosphere" (atm), which is approximately equal to 101325 Pa.

Standard pressure is the average atmospheric pressure at sea level at a temperature of 15 degrees Celsius. It is used as a standard reference point because it is the pressure that most people experience at sea level. However, atmospheric pressure can vary significantly due to changes in weather conditions, altitude, and other factors.

Standard pressure is used in various fields, including meteorology, aviation, and engineering. In meteorology, it is used to measure and predict weather patterns. In aviation, it is used to calculate aircraft performance and fuel consumption. In engineering, it is used in the design and testing of systems and components that operate under atmospheric conditions.

Standard pressure is also used in the definition of other units of pressure, such as the bar and the torr. One bar is equal to 100000 Pa, and one torr is equal to approximately 133.322 Pa. These units are often used in scientific and engineering applications where precise measurements of pressure are required.