E, base of natural logarithms

AP(j = dry bed pressure drop, in. water/ft AP = operating pressure drop, in. liquid/ft e = base of natural logarithms Xi,X2 = curve fit coefficients for C2, Table 9-32. 

T = absolute temperature, d=an arbitrary value in °K, k=covolume constant, T2 =absol temp of detonation and p2 —pressure of detonation, a=constant originally assigned as —1/3, but later changed to -1/4 b 0.3 d=0 and e = base of natural logarithm. The covolume constant k was taken as an additive covolume constant by summing the values for each type of molecule weighted by its mole fraction. 

C = constant depending on compn of expl e=base of natural logarithms (2.718)... 

Exponentials and logarithms appear in many formulas in chemistry. We have already encountered them in the definitions of prefixes in Table 1.2, which are essentially a shorthand to avoid large powers of ten (we can write 17 ps instead of 1. 7 x 10-11 s). In addition to powers of 10, we frequently use powers of e = 2.7183. .. and occasionally use powers of 2. The number e (base of natural logarithms) arises naturally in calculus, for reasons we will discuss briefly later (calculus classes explain it in great detail). Powers of e occur so often that a common notation is to write exp(x) instead of e. ... 

A = Arrhenius constant e = base of natural logarithm Ea = activation energy R = universal gas constant T = temperature (K)... 

C Concentration in xnols per liter, capacity c Concentration in equivalents per liter, normality D Dielectric constant d Differential E Electromotive force Bu Constant in pH scale e Base of natural logarithms e Electron... 

Ev b = energy of activation for viscous flow, cal./gm. mole. aEv = internal energy of vapqrization, cal./gm. mole. e = base of natural logarithms, 2.7183. 

E = fractional stage eificiency. e = base of natural logarithms, 2.7183. 

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