Pressure

Pressure is a force exerted over an area. It is the measure of how much force is acting on a given area. The formula for pressure is:

Pressure = Force / Area

Units of Pressure

The standard unit of pressure is the Pascal (Pa), which is equal to one Newton per square meter (N/m²). Other common units of pressure include atmospheres (atm), millimeters of mercury (mmHg), and pounds per square inch (psi).

Factors Affecting Pressure

The pressure of a gas is affected by its temperature, volume, and the number of gas molecules present. As the temperature and/or volume of a gas increase, the pressure also increases. This relationship is described by the ideal gas law:

Pressure x Volume = Number of moles x Gas constant x Temperature

Applications of Pressure

Pressure is involved in various natural phenomena and practical applications, such as weather systems, scuba diving, hydraulics, and flight. Understanding pressure is crucial in engineering, physics, and environmental science.

Study Guide

Define pressure and explain its formula.
Describe the units of pressure and their conversions.
Explain the factors that affect the pressure of a gas.
Provide examples of how pressure is applied in real-life situations.
Discuss the significance of understanding pressure in different scientific fields.

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EARTH AND SPACE SCIENCE

Earth and Human Activity

Implement scientific principles to design processes for monitoring and minimizing human impact on the environment (e.g., water usage, including withdrawal of water from streams and aquifers or construction of dams and levees; land usage, including urban development, agriculture, or removal of wetlands; pollution of air, water, and land).