<P> Surfactants are commonly found in soaps and detergents . Solvents like alcohol are often used as antimicrobials . They are found in cosmetics, inks, and liquid dye lasers . They are used in the food industry, in processes such as the extraction of vegetable oil . </P> <P> Liquids tend to have better thermal conductivity than gases, and the ability to flow makes a liquid suitable for removing excess heat from mechanical components . The heat can be removed by channeling the liquid through a heat exchanger, such as a radiator, or the heat can be removed with the liquid during evaporation . Water or glycol coolants are used to keep engines from overheating . The coolants used in nuclear reactors include water or liquid metals, such as sodium or bismuth . Liquid propellant films are used to cool the thrust chambers of rockets . In machining, water and oils are used to remove the excess heat generated, which can quickly ruin both the work piece and the tooling . During perspiration, sweat removes heat from the human body by evaporating . In the heating, ventilation, and air - conditioning industry (HVAC), liquids such as water are used to transfer heat from one area to another . </P> <P> Liquid is the primary component of hydraulic systems, which take advantage of Pascal's law to provide fluid power . Devices such as pumps and waterwheels have been used to change liquid motion into mechanical work since ancient times . Oils are forced through hydraulic pumps, which transmit this force to hydraulic cylinders . Hydraulics can be found in many applications, such as automotive brakes and transmissions, heavy equipment, and airplane control systems . Various hydraulic presses are used extensively in repair and manufacturing, for lifting, pressing, clamping and forming . </P> <P> Liquids are sometimes used in measuring devices . A thermometer often uses the thermal expansion of liquids, such as mercury, combined with their ability to flow to indicate temperature . A manometer uses the weight of the liquid to indicate air pressure . </P>

What are the 3 properties of a liquid