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Topic: Millimetre of mercury

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Torr

	Thermometry - LoveToKnow 1911
		With mercury the evaporation is almost inappreciable at 100° C., and can in all cases be avoided by exposing the upper parts of the emergent thread to the temperature of the air.
		Instead of removing mercury from the overflow bulb M in connexion with the thermometric bulb, mercury is introduced from a higher level into the standard bulb S so as to raise its pressure to equality with that of T at constant volume.
		In observing the temperature of a long column of mercury, as in the method of equilibrating columns for determining the absolute expansion of mercury, a platinum thermometer with a bulb equal in length to the column may similarly be employed with advantage.
	www.1911encyclopedia.org /Thermometry (17675 words)

	Torr - Wikipedia, the free encyclopedia
		The torr (symbol: Torr) or millimetre of mercury (mmHg) is a non-SI unit of pressure.
		It is the atmospheric pressure that supports a column of mercury 1 millimetre high.
		Although they are synonyms in practice, the torr and millimetre of mercury are very slightly different by virtue of their definitions in British Standard BS 2520 ([1], [2]).
	en.wikipedia.org /wiki/Torr (475 words)

	Pressure - Wikipedia, the free encyclopedia
		The most common choices are mercury (Hg) and water; water is nontoxic and readily available, while mercury's density allows for a shorter column (and so a smaller manometer) to measure a given pressure.
		When 'millimetres of mercury' or 'inches of mercury' are quoted today, these units are not based on a physical column of mercury; rather, they have been given precise definitions that can be expressed in terms of SI units.
		Blood pressure is measured in millimetres of mercury in most of the world, and lung pressures in centimeters of water are still common.
	en.wikipedia.org /wiki/Pressure (1663 words)

	Recommendations of the BHS: Equipment
		Towards this end kilopascal equivalents to millimetres of mercury are shown in the table.
		The mercury sphygmomanometer consists of a manometer, an inflatable bladder in a cuff, and an inflation-deflation device.
		Mercury column manometer The meniscus should be clearly visible and not obscured by oxidised mercury on the inside of the glass.
	www.abdn.ac.uk /medical/bhs/booklet/equipmen.htm (1801 words)

	torr - Article and Reference from OnPedia.com
		One torr was originally defined as the pressure exerted by a depth of one millimeter of mercury (mmHg), and then as 1/760 of a standard atmosphere.
		Although the torr is still in common use in low-pressure engineering, the pascal is now the recommended unit of pressure.
		This unit (usually under the millimeter of mercury name) remains the most common unit for the measurement of blood pressure in much of the world.
	www.onpedia.com /encyclopedia/torr (111 words)

	Pressure - Facts, Information, and Encyclopedia Reference article
		The obsolete unit inch of mercury (inHg) is still sometimes used in the United States.
		Blood pressure is still measured in millimetres of mercury in most of the world, and lung pressures in centimeters of water are still common.
		When millimetres or inches of mercury are used today, they have precise definitions that can be expressed in terms of SI units.
	www.startsurfing.com /encyclopedia/p/r/e/Pressure.html (1157 words)

	METAL (through Fr. fro... - Online Information article about METAL (through Fr. fro...
		Mercury -38.8 357.3 Caesium 26-27 Gallium 3o.I Rubidium 38.5 Potassium 62.5 719-731 Sodium 95.6 861-954 Indium 155 Lithium 180.o Tin 231'9 1450-1600 Bismuth 269 z 1090-1450 Thallium 290 Cadmium 320.7 78o Lead 327.7 1450-1600 Zinc' 419 929-954 Incipient red heat 525 Antimony 629.5 Magnesium.
		Mercury, within The metals to be referred to are always understood to be given in the compact (frozen) condition, and that, wherever metals are enumerated as being similarly attacked, the degree of readiness in the action is indicated by the order in which the several members are named—the more readily changed metal always See also:
		All chlorides, except those of silver and mercury (and, of course, those of gold and platinum), are oxidized by steam at high temperatures, with elimination of hydrochloric acid.
	encyclopedia.jrank.org /MEC_MIC/METAL_through_Fr_from_Lat_metal.html (5890 words)

	GAS - Online Information article about GAS
		bath to secure certainty and uniformity of temperature, the temperature must be estimated from the readings of mercury thermometers suspended in mercury tubes or in the air near the manometer.
		atmosphere, and in the temperature of the mercury columns, he did not feel able to rely on the pressure readings (depending on observations of four mercury surfaces with the cathetometer) to less than a tenth of a millimetre of mercury, which experience showed to be about the limit of accuracy of his observations.
		But by using a pair of bulbs like M and S simultaneously in the same bath, and measuring the small difference of pressure with an oil-gauge, a higher order of accuracy may be attained in the measurement of the small differences than by the method of indirect comparison.
	encyclopedia.jrank.org /GAG_GEO/GAS.html (4594 words)

	CRM Engineering Services :: www.crmeng.com
		centimetre of mercury (0°C) centimetre of water - conventional
		inch of mercury (32°F) inch of mercury (60°F) inch of mercury (68°F; 20°C) inch of water - conventional
		millimetre of mercury (0°C) millimetre of mercury - conventional
	www.crmeng.com /units/pressure.htm (148 words)

	Barometers
		That pressure [force per unit area] is measured in a number of unit but the one you usually hear on the TV weather is:" millimeters of mercury (mm Hg)." We will skip why that is so, but the point is:" The larger the number, the higher the atmospheric pressure.
		To increase their accuracy, >mercury barometers are often corrected for ambient temperature and the local >value of gravity.
		Common pressure units include pounds per square inch; >dynes per square centimetre; newtons per square metre (the SI unit called >the pascal); inches, centimetres, or millimetres of mercury; and millibars >(1 millibar equals 1,000 dynes per square centimetre, or 0.75 millimetre of >mercury).
	www.newton.dep.anl.gov /askasci/wea00/wea00031.htm (911 words)

	Blood pressure measurement is changing! -- O'BRIEN 85 (1): 3 -- Heart
		Mercury is a toxic, persistent, and bioaccumable substance, many tons of which are distributed throughout the world to hospitals
		The passing of mercury sphygmomanometers should not in itself be a cause for concern.
		Banning mercury from clinical use raises another issue of importance for clinical medicine.
	heart.bmjjournals.com /cgi/content/full/85/1/3 (1896 words)

	VACUUM TUBE - Online Information article about VACUUM TUBE
		water-pump which reduces the pressure to that due to a few millimetres of mercury and the charcoal strongly heated at this low pressure to drive off any gases it may have absorbed.
		kind of gases present in the tube, as in monatomic gases, such as mercury vapour, even aluminium sputters badly.
		rs b of the article CONDUCTION, ELECTRIC (Through Gases) represents the appearance of the discharge when the pressure in the tube is comparable with that due to a millimetre of mercury and for a particular intensity of current.
	encyclopedia.jrank.org /TUM_VAN/VACUUM_TUBE.html (2494 words)

	UK's National Pressure Standards - Pressure units
		(2) The conventional millimetre of mercury (mmHg) and the conventional inch of mercury (inHg) are defined in terms of the pressure generated by a mercury column of unit length and of assigned density 13595.1 kg/m
		(3) The so-called 'manometic' pressure unit definitions such as millimetres of mercury and inches of mercury depend on an assumed liquid density and acceleration due to gravity, assumptions which inherently limit knowledge of their relationship with the pascal.
		The end is in sight for the so called ‘manometric’ pressure units, such as inches of water, millimetres of water, inches of mercury and millimetres of mercury, but a large part of the pressure community seems unaware of the potential problems in store for them.
	www.npl.co.uk /pressure/punits.html (884 words)

	Toronto Rehab: News & Events
		However, after one month of treatment with CPAP, the average dimension of the heart at the end of a beat was reduced by three (3) millimetres from 55 to 52 millimetres.
		In contrast, the blood pressure of those patients who received the CPAP treatment decreased from 126/62 to 116/59 millimetres of mercury.
		This 10 millimetre of mercury drop in systolic blood pressure is significant and was achieved in addition to the effects of any medication the patients were taking.
	www.torontorehab.on.ca /news-view.cfm?autoid=34 (1473 words)

	Chem1 Properties of gases: Introduction
		The older unit millimetre of mercury (mm Hg) is almost the same as the torr; it is defined as one mm of level difference in a mercury barometer at 0°C. In meteorology, the pressure unit most commonly used is the bar:
		The U-tube is partially filled with mercury, one end is connected to container, while the other end is left open to the atmosphere.
		The pressure inside the container is found from the difference in height between the mercury in the two sides of the U-tube.
	www.chem1.com /acad/webtext/gas/gas_1.html (1806 words)

	The Tribune, Chandigarh, India - Health Tribune
		The abbreviation "mm Hg" means millimetre of mercury, a unit for measuring pressure.
		The moms were exposed to different types of stressful situations ranging from those considered "emotional or relevant" — watching a video about hurt and lost children, to those considered "non- threatening or non-relevant" — such as public speaking and maths problems.
		The preliminary findings show that the breast-feeding moms had reduced levels of cortisol (indicating less stress) during the emotional and non-threatening stress situations.
	www.tribuneindia.com /2005/20050810/health.htm (3653 words)

	Taubes paper - News4
		University of Copenhagen researchers analysed 114 randomised trials of sodium reduction, concluding that the benefit for hypertensives was significantly smaller than could be achieved by drugs, and that a ‘measurable’ effect in normotensives of even a single millimetre of mercury could only be achieved with an ‘extreme’ reduction in salt intake.
		Advocates of salt reduction insist that the controversy is a) either non-existent, or b) due solely to the influence of the salt lobby and its paid consultant-scientists.
		The benefits from the world’s population reducing its average blood pressure by a single millimetre of mercury would be important.
	www.saltinfo.com /news4.htm (2191 words)

	The Hindu : Air pressure on ISS drops again
		"Air pressure is currently decreasing at a rate of about one millimetre of mercury a day," the spokesman said.
		Since Dec. 22 air pressure on the ISS has declined from the normal 760 millimetres to 726.5 millimetres.
		He explained that the safe pressure range was 610 to 880 millimetres.
	www.hindu.com /2004/01/10/stories/2004011002261400.htm (201 words)

	Identifying barometer type
		A Fortin barometer can be identified by its axial screw on the bottom - for adjusting the level of the mercury in its glass cistern at the bottom.
		A Kew Pattern barometer does not have such an adjusting screw and the cistern is made of steel so it is not possible to see the mercury's lower surface.
		(Kew Pattern instruments have their pressure scales 'compressed' to allow for the fact that as the mercury surface in the barometer tube rises the surface in the cistern falls - adding to the total height, or length, of the mercury column.
	www.npl.co.uk /pressure/faqs/identify.html (518 words)

	BBC News Online \| Health \| Child blood pressure warning
		They measured both systolic pressure, which shows the force blood exerts on the artery walls when the heart beats, and diastolic pressure, which shows the force on the arteries between heartbeats.
		In 1988 to 1994 the children's average systolic blood pressure was 104.6mm Hg (millimetres of mercury).
		Dr Jeffrey Cutler, who led the research, said past research had suggested that for each one to two millimetre mercury rise in systolic blood pressure, children faced a 10% increased risk of developing hypertension as a young adult.
	news.bbc.co.uk /nolpda/ukfs_news/hi/newsid_3683000/3683325.stm (484 words)

	Horror Vacui? - More or less empty - IMSS
		This was the first time that the existence of the vacuum had been claimed not at the level of pure speculation, but with the back-up of convincing experimental evidence.
		Naturally, the torricellian vacuum was not a perfect vacuum, because mercury vapours stayed in the space created by the liquid metal's descent.
		It took only another ten years and the invention of the air-pump to succeed in making better and better vacuums, which encouraged experimentation.
	galileo.imss.firenze.it /vuoto/efondo7.html (236 words)

	Part I
		For instance, in heat-and-power engineering pressure of steam in a boiler is measured and expressed as atmosphere, but pressure in a capacitor is measured in millimeters of mercury.
		But, millimetres of mercury remind us of experiments by Torricelli («Torricellian vacuum», or torr; millimetre of mercury in Mathcad).
		In heat-and-power engineering, the exclusion of «off-system units» (atmospheres and millimeters of mercury) in favour of the pascal is not convenient.
	twt.mpei.ac.ru /ochkov/Units/Part_1_eng.htm (1955 words)

	BIPM - Table 8
		Prior to 1982 the standard pressure used to be the standard atmosphere, equal to
		The millimetre of mercury is a legal unit for the measurement of blood pressure in some countries.
		The ångström is widely used by x-ray crystallographers and structural chemists because all chemical bonds lie in the range 1 to 3 ångströms.
	www.bipm.org /en/si/si_brochure/chapter4/table8.html (483 words)

	[No title]
		A flow of one liter per second at a pressure of one micrometer of mercury."""], }, "Pressure and Stress":{".base_unit":"pascal", "pascal": [(m,1.0),"Pa","""Named after the French philosopher and mathematician Blaise Pascal (1623 - 1662).
		Equal to one newton per square meter."""], "kilopascal": [(m,1.0e3),"kPa",""""""], "megapascal": [(m,1.0e6),"MPa",""""""], "atmosphere": [(m,101325),"atm",""""""], "bar": [(m,1.0e5),"bar","""From the Greek word baros."""], "pound force per square inch": [(m,6894.75729316836),"psi",""""""], "inch of mercury (60degF)": [(m,3337.0),"inHg",""""""], "foot of water (60degF)": [(m,12*249.08891),"",""""""], "inch of water (60degF)": [(m,249.08891),"inH20",""""""], "torr": [(m,133.322368421),"","""Named after Italian physicist and mathematician Evangelista Torricelli, (1608-1647).
		A unit of pressure equal to 0.001316 atmosphere."""], "millimetre of mercury (0degC)": [(m,133.322368421),"mmHg",""""""], "millibar": [(m,1.0e2),"mbar",""""""], "pound force per square foot": [(m,47.8802589803358),u"lbf/ft\xb2",""""""], "kilogram force per square metre": [(m,9.80665),u"kgf/m\xb2",""""""], "newton per square metre": [(m,1.0),u"N/m\xb2",""""""], "microbar": [(m,1.0e-1),u"µbar",""""""], "dyne per square centimetre": [(m,1.0e-1),"",""""""], "barie
	unihedron.com /projects/gonvert/downloads/gonvert.py (6025 words)

	Air Compressor-Roots Type Blower-Refrigerated Desiccant and Membrane Compressed Air Dryer-Filter
		The press exerted by a column of liquid of height h and density ?
		o centimetre, inch, and millimetre of mercury (Torr).
		o millimetre, centimetre, metre, inch, and foot of water.
	www.gaeicc.com /defvps.htm (1334 words)

	:: Welcome to Manila Bulletin Online ::
		University scientists, in a study, measured the blood pressure of 4,763 seven-year-old children to see if those who had been breast-fed did better those those who were bottle-fed.
		They found that those 34 per cent of babies who were breast-fed beyond the age of two months on average had a blood pressure one millimetre of mercury lower than children brought up exclusively on formula milk.
		The longer that a child was breast-fed, the bigger the difference in their blood pressure, which contributes to heart attacks, the researchers reported.
	www.mb.com.ph /issues/2004/03/29/MAIN200403296043.html (533 words)

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