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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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Abbrev. for position angle.

Pennsylvania State Information

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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%

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    Symbol for pascal; a unit of pressure.


    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.


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


    The country code for Panama.
    References in periodicals archive ?
    In India, the sources of indoor PAHs are cooking, smoking, burning of natural gas, liquid petroleum gas, kerosene, wood, dung, coal, candles and incense sticks while the sources of outdoor PAHs include transport.
    It is traditionally assumed that the high concentrations of PAHs in the bottom deposits of Lake Peipsi (L.
    2012), for each PAH, we used the magnitude of the variance ratio to estimate the potential impact of measurement error on an odds ratio [(OR.
    He said that other studies that had linked air pollution with asthma and allergy had failed to distinguish between PAHs and other pollutants that could contribute to the conditions, such as ozone or particulate matter.
    One should be alert to signs of PAH (dyspnoea on exercise, chronic cough, fatigue), complications or side-effects of ARV therapy, and symptoms and signs of OSA.
    More than 100 different PAHs exist, most of which are complex mixtures, not single compounds.
    Key topics covered include strategic competitor assessment, market characterization, unmet needs and the implications for the future market associated with PAH.
    Samples corresponding to soil microbiota in pyrene, benzo[a]pyrene and a mix of all PAHs were loaded in the same gel to following profiles comparison of microbiota dynamic when using only pyrene--the most 4-ring degradable PAH by microorganisms served as a model to HMW-PAH studies, benzo[a]pyrene--the most toxic and mutagenic PAH with high resistance of biodegradation) and a mixture of several PAH--with probable metabolic cooperation and co-metabolic growth in the microbial community.
    Excluded were 29 women with PAH associated with congenital heart disease, and 15 with PAH of other etiologies.
    PAH was suspected in those with peak velocity of tricuspid regurgitation (VTR) of 2.
    The objective of this study was to establish the leaching behavior of creosote-treated wood submerged in flowing fresh water by monitoring the PAH concentrations over time under different flow rates.