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Topic: Standard conditions for temperature and pressure

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	Standard conditions for temperature and pressure - Wikipedia, the free encyclopedia
		In chemistry and other sciences, STP or standard temperature and pressure is a standard set of conditions for experimental measurements, to enable comparisons to be made between sets of data.
		In industry and commerce, it is necessary to define the standard reference conditions of temperature and pressure when expressing a gas volume or a volumetric flow rate because the volume of a gas varies with the temperature and pressure of the gas.
		In aeronautics and fluid dynamics the term "International Standard Atmosphere" is often used to denote the variation of the principal thermodynamic variables (pressure, temperature, density, etc.) of the atmosphere with altitude at mid latitudes.
	en.wikipedia.org /wiki/Standard_temperature_and_pressure (1681 words)

	STP
		STP or standard temperature and pressure,standard conditions for measurement of the properties of matter.
		The standard temperature is the freezing point of pure water, 0°C or 273.15K.
		The standard pressure is the pressure exerted by a column of mercury (symbol Hg) 760 mm high, often designated 760 mm Hg.
	www.factmonster.com /id/A0846864 (193 words)

	[No title] (Site not responding. Last check: 2007-10-22)
		Under standard conditions of temperature and pressure, and also at higher temperatures and lower pressures, the behavior of most real gases such as oxygen, nitrogen, and carbon dioxide is that predicted by the gas laws and the kinetic molecular theory.
		However, as the temperature of a gas is decreased, the kinetic energy of the molecules decreases, their movement becomes more sluggish, and the attractive forces that exist between real molecules play a larger role in determining the behavior of the sample.
		Likewise, if the pressure is increased and the volume decreased until the volume of the space between the molecules approximates the volume of the molecules themselves, the molecules can no longer act as the wholly independent particles postulated by the kinetic molecular theory.
	genchem.chem.wisc.edu /sstutorial/Text9/Tx98/tx98.html (604 words)

	Glossary (Site not responding. Last check: 2007-10-22)
		Absolute pressure is equal to the sum of atmospheric pressure and gauge pressure, normally expressed as psia.
		Near sea level, atmospheric pressure is approximately 14.7 psia.
		Standard cubic feet: Volumetric measurement of gas at standard conditions of temperature and pressure.
	www.minerspisani.com /glossary.htm (190 words)

	temperature
		A temperature scale is determined by choosing two reference temperatures and dividing the temperature difference between these two points into a certain number of degrees.
		STP - STP or standard temperature and pressure,standard conditions for measurement of the properties of...
		Temperature and embryonic development in relation to spawning and field occurrence of larvae of three Antarctic echinoderms.
	www.infoplease.com /id/A0848123 (516 words)

	The MSDS HyperGlossary: Standard Temperature and Pressure (STP)
		The MSDS HyperGlossary: Standard Temperature and Pressure (STP)
		Standard Temperature and Pressure (STP) is defined as 0 degrees Celsius and 1 atmosphere of pressure.
		The letters "STP" occur most commonly on an MSDS after a physical property such as the density or flammable limit of a gas or the vapor pressure of a material.
	www.ilpi.com /msds/ref/stp.html (535 words)

	Standard temperature and pressure - Gurupedia
		In chemistry, the term standard temperature and pressure (abbreviated STP) denotes an exact reference temperature of 0°C (273.15 K) and
		The chemical term standard ambient temperature and pressure (SATP) denotes 25°C and 100 kPa.
		ballistics, defines sea-level conditions as 29.5275 inHg of pressure (99.9916 kPa), 59°F (15°C), and 78% humidity.
	www.gurupedia.com /s/st/standard_temperature_and_pressure.htm (199 words)

	Pressure altitude - Wikipedia, the free encyclopedia
		In aviation, pressure altitude is the indicated altitude when an altimeter is set to 1013 hPa (29.92 inHg US and Canada).
		It is primarily used in aircraft performance calculations, and in high-altitude flight (Class A airspace in the United States, which is controlled airspace at or above 18,000 feet).
		The relation between static pressure and pressure altitude is defined in terms of the properties of the International Standard Atmosphere (ISA).
	en.wikipedia.org /wiki/Pressure_altitude (112 words)

	Environmental Protection Agency > Basic Concepts in Environmental Sciences > Module 2 > Rate
		The ideal gas law tells us that this gas flow rate varies depending on the temperature and pressure of the gas stream and the number of moles of gas moving per unit of time.
		The standard gas flow rate is the gas flow rate expressed at standard conditions of temperature (20°C or 68°F) and pressure (14.7 psia or 407 in.
		Standard conditions are defined as 20°C (68°F) and 1 atm (14.7 psia) pressure.
	www.epa.gov /eogapti1/module2/rate/rate.htm (1309 words)

	Standard temperature and pressure at opensource encyclopedia (Site not responding. Last check: 2007-10-22)
		In chemistry, the term standard temperature and pressure (abbreviated STP) denotes an exact reference temperature of 0°C (273.15 K) and pressure of 1 atm (defined as 101,325 Pa) or 101.325 kPa.
		In aviation, standard temperature and pressure at sea level are 15°C and 29.92 in.
		When used to calculate performance at any pressure altitude other than sea level, the temperature is adjusted using the dry adiabatic lapse rate.
	www.wiki.tatet.com /Standard_temperature_and_pressure.html (316 words)

	90.311 Test conditions. (Site not responding. Last check: 2007-10-22)
		(1) Ambient temperature levels encountered by the test engine throughout the test sequence may not be less than 20 °C or more than 30 °C. All engines must be installed on the test bed at their design installation angle to prevent abnormal fuel distribution.
		(2) Calculate all volumes and volumetric flow rates at standard conditions for temperature and pressure, and use these conditions consistently throughout all calculations.
		Standard conditions for temperature and pressure are 25 °C and 101.3 kPa.
	www.setonresourcecenter.com /cfr/40CFR/P90_069.HTM (164 words)

	Clathrates - little known components of the global carbon cycle
		Clathrates occur wherever the conditions within the sediments are in the methane-clathrate stability field, and where methane and water are available (Fig.
		This stability is limited by temperature and pressure: gas hydrates are stable at low temperatures and/or high pressures.
		Because of the requirements of pressure and temperature, and because of requirement of relatively large amounts of organic matter for bacterial methanogenesis, clathrates are mainly restricted to two regions: 1.
	ethomas.web.wesleyan.edu /ees123/clathrate.htm (2582 words)

	[No title]
		Hint 1: Standard Conditions Standard conditions are necessary for most quantitative determinations in chemistry.
		Hint 3: Non-Standard Conditons Many chemical determinations are made under standard conditions of temperature, pressure, and/or concentration, and can, in most cases, be ignored from the calculations.
		In a quantitative experiment, this would yield a mean value with a low standard deviation (the average distance away of each of the values from the average of all the values).
	stw.ryerson.ca /~k4macdon/chemhints.txt (1848 words)

	Molar Volume of Oxygen (Site not responding. Last check: 2007-10-22)
		Heat the mixture in the test tube gently at first by moving the flame back and forth along the tube and then more strongly as needed to maintain a steady evolution of oxygen gas as shown by its displacement of the water into the beaker.
		Measure the temperature of the gas in the flask by partially removing the stopper and inserting a thermometer into the vapor.
		The vapor pressure of water at the temperature of the water in the flask is found in the CRC Handbook of Chemistry and Physics available in the lab.
	www.nv.cc.va.us /alexandria/science/MVO00.htm (819 words)

	Chemistry 30 Equilibrium - Effect of Changing Volume and Pressure
		You may remember from earlier chemistry classes that equal volumes of gases contain an equal number of particles and, under standard conditions of temperature and pressure (STP), one mole of gas occupies a volume of 22.4 L. This is known as the molar volume of gases.
		If you increase the pressure of a system at equilibrium (typically by reducing the volume of the container), the stress will best be reduced by reaction favouring the side with the fewest moles of gas, since fewer moles will occupy the smallest volume.
		Increasing the pressure favours the side with the fewest moles of gas, so the equilibrium will shift to the left (the reverse reaction will be favoured).
	www.saskschools.ca /~chem30_dev/3_equilibrium/equil_3_3.htm (376 words)

	Statute: § 90.311 Test conditions. (Site not responding. Last check: 2007-10-22)
		(1) Ambient temperature levels encountered by the test engine throughout the test sequence may not be less than 20 [degrees] C or more than 30 [degrees] C. All engines must be installed on the test bed at their design installation angle to prevent abnormal fuel distribution.
		Standard conditions for temperature and pressure are 25 [degrees] C and 101.3 kPa.
		Measure the absolute temperature (designated as T and expressed in Kelvin) of the engine air at the inlet to the engine and the dry atmospheric pressure (designated as p[s] and expressed in kPa), and determine the parameter f according to the following provisions for naturally aspirated engines:
	www.arb.ca.gov /bluebook/bb05/40cfr/40cfr90_311.htm (150 words)

	STP - Standard Temperature and Pressure & NTP - Normal Temperature and Pressure
		Since temperature and air pressure may vary form place to place it is necessary with standard reference conditions for testing and documentation of chemical and physical processes.
		STP is commonly used to define standard conditions for temperature and pressure which is important for the measurements and documentation of chemical and physical processes:
		SATP - Standard Ambient Temperature and Pressure is a reference with temperature of 25 degC (298.15 K) and pressure of 101 kPa.
	www.engineeringtoolbox.com /stp-standard-ntp-normal-air-d_772.html (503 words)

	Standard temperature and pressure (Site not responding. Last check: 2007-10-22)
		In chemistry the term standard temperature and pressure (abbreviated STP) denotes an exact reference temperature of 0° C (273.15 K) and pressure of 1 atm (defined as 101.325 kPa).
		The International Civil Aviation Organisation (ICAO) defines the sea-level International Standard Atmosphere (ISA) as 101.325 kPa 15°C and 0% These values provide a reference for calculating aircraft performance figures such as endurance range airspeed and fuel consumption.
		When used to performance at any pressure altitude other than sea level the temperature adjusted using the prescribed dry adiabatic lapse rates (which are -6 5°C/km for the 11 km).
	www.freeglossary.com /Standard_temperature_and_pressure (450 words)

	International Financial Reporting Standards (Site not responding. Last check: 2007-10-22)
		International Financial Reporting Standards (IFRS), often known by the older name of International Accounting Standards (IAS) are a set of accounting standards.
		IASs were issued between 1973 and 2001 by Board of the International Accounting Standards Committee (IASC).
		In April 2001 the IASB adopted all IASs and continued the development, calling new standards IFRSs [1].
	www.kiwipedia.com /international-accounting-standards.html (78 words)

	Articles - Standard temperature and pressure (Site not responding. Last check: 2007-10-22)
		It is absolutely necessary to define the standard reference conditions of temperature and pressure when expressing a gas volume or a volumetric flow rate because the volume of a gas varies with the temperature and pressure of the gas.
		The data in this article show quite clearly that there is no universally accepted single definition of the standard conditions of temperature and pressure.
		For many years, most engineers, chemists, physicists and other scientists using the metric system of units defined the standard reference conditions of temperature and pressure for expressing gas volumes as being 0Â°C (273.15 K) and 101.325 kPa (i.e.
	www.zdiamond.net /articles/Standard_temperature_and_pressure (1515 words)

	oil refining
		It is checked on standard sieves by careful air stream sieving as well as on particle size analyser.
		We filter oil under standard conditions of temperature and pressure difference over an oil-wet-filter-cake.
		Stringent standards are followed and maintained to ensure fast filtration rate of Refoil Earth.
	www.bleachingearth.com /quality.html (216 words)

	What is standard temperature and pressure? - a definition from Whatis.com - see also: pressure, standard, temperature, ...
		Standard temperature and pressure, abbreviated STP, refers to nominal conditions in the atmosphere at sea level.
		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).
	whatis.techtarget.com /definition/0,,sid9_gci539342,00.html (234 words)

	Environmental Protection Agency > Basic Concepts in Environmental Sciences > Module 4 > Vapor Pressure > ...
		If a liquid has a vapor pressure of 1 psia at 60°F and is in equilibrium with a gas at 14.7 psia absolute pressure, what is the (i) mole fraction and (ii) volume percent of the vaporized species?
		The hydrocarbon compound heptane has a vapor pressure of 0.8 psia at a temperature of 68°F in water.
		Assume that the air is at standard conditions of temperature and pressure.
	www.epa.gov /eogapti1/module4/vaporpres/pp_answer/p_answer.htm (180 words)

	Air pressure and Standard Atmosphere (Site not responding. Last check: 2007-10-22)
		BOREAS AFM-05 Level-2 Upper-Air Network Standard Pressure Level Data...
		Standard conditions for temperature and pressure: Definition and Much More From...
		EHSO presents the OSHA Respiratory Protection Standard - 29 CFR 1910.134 free to...
	www.scienceoxygen.com /aviation/6.html (170 words)

	[No title]
		The static pressure and temperature coefficients of laboratory standard microphones
		The sensitivity of condenser measurement microphones depends on the environmental conditions, which affect the acoustic properties of the air enclosed between the diaphragm and the back electrode and in the cavity behind the back electrode.
		Use of this service is subject to compliance with the terms and conditions of use.
	stacks.iop.org /0026-1394/36/265 (288 words)

	Airmetrics: MiniVol Calibration and Auditing Procedures
		: Actual volumetric air flow rates that are measured and expressed at existing conditions of temperature and pressure are denoted by Q
		: Air flow rates that have been corrected to EPA standard conditions of temperature and pressure (25 EC or 298 EK, and 760 mm Hg or 101 kPa) are denoted by Q
		Standard volume flow rates are often used by engineers and scientists and are equivalent to mass flow units.
	www.airmetrics.com /products/minivol/calibration2.html (302 words)

	Week 4
		of hydrogen gas at standard temperature and pressure (0°C, 1 atm).
		How many molecules of oxygen are there in each breath of air (at STP, assume one breath is one litre and 20% of the air is oxygen)?
		gas under standard conditions of temperature and pressure.
	www.lsbu.ac.uk /biology/biolchem/week_4.html (223 words)

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