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preface to fifteenth edition

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2.32 SECTION 2<br />

TABLE 2.6<br />

Abbreviations and Standard Letter Symbols (Continued)<br />

Pounds per square inch psi<br />

Powder<br />

pwd<br />

Power<br />

p<br />

Poynting vec<strong>to</strong>r<br />

S<br />

Prandtl number<br />

Pr<br />

Pressure (partial)<br />

p<br />

Pressure (<strong>to</strong>tal)<br />

p, P<br />

Pressure coefficient<br />

<br />

Pressure, column inlet p i<br />

Pressure, column outlet p o<br />

Pressure, critical<br />

p c<br />

Pressure drop<br />

P<br />

Pressure-gradient correction j<br />

Principal moments of inertia I A ; I B ; I C<br />

Principal quantum number n<br />

Probability<br />

P<br />

Probability density<br />

P<br />

Product sign<br />

<br />

Propyl<br />

Pr<br />

Pro<strong>to</strong>n<br />

p<br />

Pro<strong>to</strong>n magnetic resonance pmr<br />

Pro<strong>to</strong>n magnetrogyric ratio p<br />

Pro<strong>to</strong>n number<br />

Z<br />

Pro<strong>to</strong>n rest mass<br />

m p<br />

Pyridine<br />

py<br />

Quadrupole interaction energy<br />

<br />

tensor<br />

Quadrupole moment of a Q, <br />

molecule<br />

Quantity of electricity, electric<br />

Q<br />

charge<br />

Quantum of energy<br />

hv<br />

Quantum yield<br />

<br />

Rad, unit of radiation dose rad<br />

Radian<br />

rad<br />

Radiant energy<br />

Q, W<br />

Radiant energy density , w<br />

Radiant energy flux<br />

dQ/dt<br />

Radiant exitance<br />

M<br />

Radiant flux received E<br />

Radiant intensity<br />

I<br />

Radiant intensity at time t I(t)<br />

after termination of excitation<br />

Radiant power<br />

<br />

Radiant power incident on P 0<br />

sample<br />

Radiofrequency<br />

rf<br />

Radius<br />

r<br />

Rate of concentration change r<br />

Rate constant<br />

k<br />

Rate of reaction<br />

v<br />

Ratioof heat capacities <br />

Reactance<br />

X<br />

Reciprocal lattice a*, b*, c*<br />

Reciprocal lattice vec<strong>to</strong>r (circular)<br />

G<br />

Vec<strong>to</strong>rs for a*; b*, c*<br />

Reciprocal radius of ionic atmosphere<br />

<br />

Reciprocal temperature parameter,<br />

<br />

1/kT<br />

Reciprocal thickness of double<br />

<br />

layer<br />

Reduced column length <br />

Reduced mass<br />

<br />

Reduced plate height h<br />

Reduced velocity<br />

v<br />

Reductant<br />

red<br />

Reference<br />

ref<br />

Reflectance<br />

<br />

Reflection plane<br />

<br />

Refractive index<br />

n<br />

Relative permeability r<br />

Relative permittivity (dielectric<br />

r<br />

constant)<br />

Relative pressure coefficient p<br />

Relative retention ratio <br />

Relaxation time<br />

<br />

Rem, unit of dose equivalent rem<br />

Residual resistivity (solid R<br />

state)<br />

Resistivity tensor<br />

<br />

Retardation fac<strong>to</strong>r<br />

R f<br />

Retarded van der Waals constant<br />

B, <br />

Retention time<br />

t R<br />

Retention volume<br />

V R<br />

Revolutions per minute rpm<br />

Reynolds number<br />

Re<br />

Rhombic<br />

rh<br />

Rhombohedral<br />

rh-hed<br />

Roentgen<br />

R<br />

Root-mean-square<br />

rms<br />

Rotational constants:<br />

In frequency<br />

A, B, C<br />

In wavenumber<br />

Ã; B˜ ;C˜<br />

Rotational term (spectroscopy)<br />

F<br />

Rotation-reflection<br />

S n<br />

Rydberg, unit of energy Ry<br />

Rydberg constant<br />

R, R <br />

Saturated<br />

satd<br />

Saturated calomel electrode SCE<br />

Schmidt number<br />

Sc<br />

Second<br />

s<br />

Second radiation constant c 2<br />

Second virial coefficient B<br />

Sedimentation coefficient s<br />

Selectivity coefficient k

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