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Pa,

symbol for the element protactiniumprotactinium
, radioactive chemical element; symbol Pa; at. no. 91; mass number of most stable isotope 231; m.p. greater than 1,600°C;; b.p. 4,026°C;; sp. gr. 15.37 (calculated); valence +4, +5. Protactinium is a malleable, shiny silver-gray radioactive metal.
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The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/

PA

or

p.a.

Abbrev. for position angle.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

Pennsylvania State Information

Phone: (717) 787-2121
www.state.pa.us


Area (sq mi):: 46055.24 (land 44816.61; water 1238.63) Population per square mile: 277.30
Population 2005: 12,429,616 State rank: 0 Population change: 2000-20005 1.20%; 1990-2000 3.40% Population 2000: 12,281,054 (White 84.10%; Black or African American 10.00%; Hispanic or Latino 3.20%; Asian 1.80%; Other 2.80%). Foreign born: 4.10%. Median age: 38.00
Income 2000: per capita $20,880; median household $40,106; Population below poverty level: 11.00% Personal per capita income (2000-2003): $29,695-$31,911
Unemployment (2004): 5.40% Unemployment change (from 2000): 1.20% Median travel time to work: 25.20 minutes Working outside county of residence: 27.60%

List of Pennsylvania counties:

  • Adams County
  • Allegheny County
  • Armstrong County
  • Beaver County
  • Bedford County
  • Berks County
  • Blair County
  • Bradford County
  • Bucks County
  • Butler County
  • Cambria County
  • Cameron County
  • Carbon County
  • Centre County
  • Chester County
  • Clarion County
  • Clearfield County
  • Clinton County
  • Columbia County
  • Crawford County
  • Cumberland County
  • Dauphin County
  • Delaware County
  • Elk County
  • Erie County
  • Fayette County
  • Forest County
  • Franklin County
  • Fulton County
  • Greene County
  • Huntingdon County
  • Indiana County
  • Jefferson County
  • Juniata County
  • Lackawanna County
  • Lancaster County
  • Lawrence County
  • Lebanon County
  • Lehigh County
  • Luzerne County
  • Lycoming County
  • McKean County
  • Mercer County
  • Mifflin County
  • Monroe County
  • Montgomery County
  • Montour County
  • Northampton County
  • Northumberland County
  • Perry County
  • Philadelphia County
  • Pike County
  • Potter County
  • Schuylkill County
  • Snyder County
  • Somerset County
  • Sullivan County
  • Susquehanna County
  • Tioga County
  • Union County
  • Venango County
  • Warren County
  • Washington County
  • Wayne County
  • Westmoreland County
  • Wyoming County
  • York County
  • Counties USA: A Directory of United States Counties, 3rd Edition. © 2006 by Omnigraphics, Inc.

    Pennsylvania Parks

    Parks Directory of the United States, 5th Edition. © 2007 by Omnigraphics, Inc.

    pA

    (electricity)

    Pa

    (mechanics)
    (chemistry)
    McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

    Pa

    Symbol for pascal; a unit of pressure.

    PA

    On drawings, abbr. for public address system.

    pascal (Pa)

    The Standard International unit of pressure; 1 pascal is equal to 1 newton per square meter.
    McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.

    pa

    , pah NZ
    1. a Maori village or settlement
    2. History a Maori defensive position and settlement on a hilltop
    Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

    pa

    (networking)
    The country code for Panama.
    This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

    PA system

    (Public Address system) A sound amplification system comprising a microphone, amplifier and speakers. Primarily used for speech, PA systems are widely used in schools, auditoriums and sports arenas.
    Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
    References in periodicals archive ?
    Hanson et al., "The dynostatic algorithm accurately calculates alveolar pressure on-line during ventilator treatment in children," Paediatric Anaesthesia, vol.
    The pressure gradient between alveolar pressure as set by the clinician, (PEEP or CPAP), and actual end expiratory alveolar pressure.
    Alveolar pressure P1 just prior to the inspiratory effort may be assumed to be equal to atmospheric pressure PATM.
    This increase in mean airway pressure (which reflects a similar increase in alveolar pressure) may help improve oxygenation but also simultaneously raises the average intra-pleural pressure, impedes venous return and may reduce cardiac output.
    Although many problems have been tamed by improved technology, noisiness is still an issue, as are uncertainties regarding true alveolar pressures and tidal volumes, staff unfamiliarity with adjustments and the real cost of the very high total ventilation associated with HFO.