32 degrees Fahrenheit (32 0 F) or 273.15 degrees kelvin (273.15 0 K) and the freezing point of pure water at sea level, in air at standard pressure. Standard temperature is defined as zero degrees Celsius (0 0 C), which translates to 32 degrees Fahrenheit (32 0 F) or 273.15 degrees kelvin (273.15 0 K).This is essentially the freezing point of pure water at sea level, in air at standard pressure.
One mole of an ideal gas will occupy a volume of 22.4 liters at STP (Standard Temperature and Pressure, 0°C and one atmosphere pressure). These can be quantified as follows: Standard temperature: 0°C = 273.15 K Standard pressure = 1 atmosphere = 760 mmHg = 101.3 kPa Standard volume of 1 mole of an ideal gas at STP: 22.4 liters. Standard pressure = 1 atmosphere = 760 mmHg = 101.3 kPa. Answer: STP in chemistry is the abbreviation for Standard Temperature and Pressure. STP most commonly is used when performing calculations on gases, such as gas density. The standard temperature is 273 K (0° Celsius) and the standard pressure is 1 atm pressure. At STP, one mole of gas occupies 22.4 L of volume (molar volume). STP commonly is used when standard state conditions are applied to calculations. Standard state conditions, which include standard temperature and pressure, may be recognized in calculations by the superscript circle.  The Standard Temperature is the freezing point of pure water, 0 C or 273.15 K. The Standard Pressure is the pressure exerted by a column of mercury (symbol Hg) 760 mm high, often designated 760 mm Hg.  The standard temperature is the freezing point of water and the standard pressure is one standard atmosphere. These can be quantified as follows: Standard temperature: 0°C = 273.15 K Standard pressure = 1 atmosphere = 760 mmHg = 101.3 kPa Standard volume of 1 mole of an ideal gas at STP: 22.4 liters. Standard pressure = 1 atmosphere = 760 mmHg = 101.3 kPa. Standard volume of 1 mole of an ideal gas at STP: 22.4 liters. Standard temperature and pressure, abbreviated STP, refers to nominal conditions in the atmosphere at sea level. This value is important to physicists, chemists, engineers, and pilots and navigators. Standard temperature is defined as zero degrees Celsius (0 0 C), which translates to 32 degrees Fahrenheit (32 0 F) or 273.15 degrees kelvin (273.15 0 K). This is essentially the freezing point of pure water at sea level, in air at standard pressure. Standard pressure supports 760 millimeters in a mercurial barometer (760 mmHg). This is about 29.9 inches of mercury, and represents approximately 14.7 pounds per inch (14.7 lb/in 2). Imagine a column of air measuring one inch square, extending straight up into space beyond the atmosphere NTP-Normal Temperature and Pressure. NTP is commonly used as a standard condition for testing and documentation of fan capacities: 1  NTP-Normal Temperature and Pressure-is defined as air at 20oC (293.15 K, 68oF) and 1 atm (101.325 kN/m2, 101.325 kPa, 14.7 psia, 0 psig, 29.92 in Hg, 407 in H2O, 760 torr). The definition of STP-Standard Temperature and Pressure and NTP-Normal Temperature and Pressure. Since temperature and air pressure vary from place to place it is necessary with a standard reference condition to compare testing and documentation of chemical and physical processes. Note! In the last five to six decades, professionals and scientists using the metric system of units defined the standard reference conditions of temperature and pressure for expressing gas volumes as being 15 °C (288.15 K; 59.00 °F) and 101.325 kPa (1.00 atm; 760 Torr). However, many technical publications (books, journals, advertisements for equipment and machinery) simply state standard conditions without specifying them, often leading to confusion and errors. Good practice is to always incorporate the reference conditions of temperature and pressure. NIST uses a temperature of 20 °C (293.15 K, 68 °F) and an absolute pressure of 101.325 kPa (14.696 psi, 1 atm). The International Standard Metric Conditions for natural gas and similar fluids are 288.15 K (15.00 °C; 59.00 °F) and 101.325 kPa. However, many technical publications (books, journals, advertisements for equipment and machinery) simply state standard conditions without specifying them, often leading to confusion and errors. Good practice is to always incorporate the reference conditions of temperature and pressure. Standard Temperature and Pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure. Gas density and volumes are compared at a Standard Temperature and Pressure of 273.15 Kelvin and 760 torr. At STP, one mole of any gas should have a volume of 22.4 liters. Related Calculator: 
http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/idegas.html http://chemistry.about.com/od/gas2/f/What-Is-Stp-In-Chemistry.htm http://www.calculatoredge.com/chemical/stp%20calc.htm http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/idegas.html http://whatis.techtarget.com/definition/standard-temperature-and-pressure-STP http://www.engineeringtoolbox.com/stp-standard-ntp-normal-air-d_772.html https://en.wikipedia.org/wiki/Standard_conditions_for_temperature_and_pressure https://en.wikipedia.org/wiki/Standard_conditions_for_temperature_and_pressure https://www.easycalculation.com/chemistry/stp.php
standard temperature and pressure for water