1) " Ph" -- As it applies to Ph Meters PH or ph or pH or Ph may be: In chemistry, Pj is a measure ofacidity.Also in chemistry, specifically organic chemistry, P stands for a Pj enyl ring. P ilippines ( ISO country code ). hP ot ( hP ), a measurement of illumination.In computational complexitytheory, Ph is the union of all complexity classes in the polynomial hierarchy. ...
2) " Meters" -- As it applies to Ph Meters This article is about the unit of length. For other uses of metre or meter, see meter (disambiguation). The metre is the basic unit of length in the International System of Units. It is defined as the length of the path travelled by light in absolute vacuum during a time interval of 1/299,792,458 ofa second. It is equal to 10000/254 inches,approximately 39.37 inches. The symbol of the metre is m. Metre is also spelled meter in American English. millimetre << centimetre << decimetre << metre << decametre << hectometre << kilometre History The word itself is from the Greek metron (μετρον), "a measure " via the French mètre. Its first recorded usage in English is from 1797. In the eighteenth century, there were two favoured approaches to the definition of the standard unit of length. One suggesteddefining the metre as the length of a pendulum with a half- period of one second. The other suggested defining the metre as oneten-millionth of the length of the earth's meridian along a quadrant (one-fourth the polar circumference of the earth). In 1791, the French Academy of Sciences selected the meridional definition, using the meridian of Paris, overthe pendular definition because of the slight variation of the force of gravity overthe surface of the earth, which affects the period of a pendulum. In 1795, France adoptedthe metre as its official unit of length. Although the first prototype metre bar was short by a fifth of a millimetre due tomiscalculation of the flattening of the earth, this length became the standard. So, the circumference of the Earth through the poles is approximately forty million metres.In the 1870s and in light of modern precision, a series of international conferenceswere held to devise new metric standards. The Treaty of the Metre ( 1875 ) mandated the...
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