pa

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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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.

PA

or

p.a.

Abbrev. for position angle.

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
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  • Armstrong County
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  • Pennsylvania Parks

    pA

    (electricity)

    Pa

    (mechanics)
    (chemistry)

    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.

    pa

    , pah NZ
    1. a Maori village or settlement
    2. History a Maori defensive position and settlement on a hilltop

    pa

    (networking)
    The country code for Panama.
    References in periodicals archive ?
    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.
    Indeed, a PPLAT of 35 cmH2O prepresents the normal peak alveolar pressure necessary to reach TLC.
    Distribution of blood flow in isolated lung: Relation to vascular and alveolar pressures.