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- Physics : The study of forces and energies in space and time.
- Chemistry : The science of matter, or of the electrical or electrostatical interactions of matter.
- Engineering : The profession in which a knowledge of the mathematical and natural sciences gained by study, experience and practice is applied with judgment to develop ways to economically use the materials and forces of nature for the benefit of mankind.
- Thermodynamics : The statistical description of the properties of molecular systems
- Chemical engineering : The field of engineering that deals with industrial and natural processes involving the chemical, physical or biological transformation of matter or energy into forms useful for mankind, economically and safely without compromising the environment
- Civil engineering : A broad field of engineering dealing with the design, construction, and maintenance of fixed structures, including roads, buildings, airports, tunnels, dams, bridges, and water supply and sewage systems.
- Mechanical engineering : The branch of engineering concerned with the utilisation of the basic laws of mathematics, thermodynamics, fluid dynamics, and system dynamics in order to create unique solutions to physical problems.
- Force : Vector quantity that tends to produce an acceleration of a body in the direction of its application.
- Atmosphere (unit) : A unit of pressure measurement (symbol: atm) defined as 101,325 pascal.
- Bar (unit) : A unit of pressure measurement (symbol: bar) defined as 100,000 Pascals.
- Dyne : Force in cgs system; symbol: dyn; 1 dyn = 10−5 N.
- International System of Units : Metric unit system based on the metre, kilogram, second, ampere, kelvin, mole and candela.
- Kilogram-force : A unit of force which will accelerate 1 kilogram of mass to 9.80665 m/s2, the standard average acceleration due to gravity on Earth's surface (referred to as gn).
- Kilogram-force per square centimeter : The kilogram-force per square centimeter (symbol: kgf/cm2 or often just kg/cm2) is a unit of pressure defined as the force exerted by one kilogram-force on one square centimeter.
- Newton : SI derived unit of force, named after Isaac Newton, equal to the amount of force required to accelerate a mass of one kilogram at a rate of one metre per second per second.
- Pascal (unit) : The SI unit of pressure; the force of one newton acting uniformly over an area of one square metre.
- Pound-force : A measurement unit of force which will accelerate 1 pound of mass to 9.80665 m/s2 (≈ 32.17405 ft/s2), the standard average acceleration due to gravity on Earth's surface (referred to as gn).
- Pound per square inch : A unit of pressure in the U.S. customary units and defined as the pressure exerted by a force of one pound-force applied to an area of one square inch.
- Torr : A non-SI unit of pressure (symbol: torr) with ratio of 760 to 1 atmosphere, selected to be approximately equal to the fluid pressure exerted by 1 millimeter of mercury (symbol: mmHg) and thus 1 torr ≈ 1 mmHg.
- U.S. customary units : The units of measurement that are currently used in the United States.
- Blaise Pascal : French mathematician, physicist, and philosopher.
- Boiling point : The temperature at which the vapor pressure of the liquid equals the external environmental pressure surrounding the liquid and the liquid initiates boiling.
- Evangelista Torricelli : Add brief definition or description
- Gas compressor : A machine that increases the pressure of a gas by reducing its volume.
- Isaac Newton : (1642–1727) English physicist and mathematician, best known for his elucidation of the universal theory of gravitation and his development of calculus.
- Kilogram : The kilogram is the basic unit of mass in the International System of Units (SI, metric system).
- Mass : The total amount of a substance, or alternatively, the total energy of a substance.
- Pound (mass) : A measurement unit of mass used in the United States customary, Imperial, and other systems of measurement.
- Partial pressure : The pressure which each gas in a gas mixture would have if it alone occupied the same volume at the same temperature.
- Reference conditions of gas temperature and pressure : The temperature and pressure conditions that define the density of a gas and serve to document a stated gas volume.
- Reid vapor pressure : A measure of the volatility of petroleum crude oil, gasoline and other volatile petroleum products that is widely used in the petroleum industry.
- Vacuum (science) : A realizable vacuum with a gaseous pressure that is much less than atmospheric.
- Vapor pressure : The pressure of a vapor in equilibrium with its liquid or solid phase.