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14 results for “hydro”

Formulae (14)

E_n = -\frac{13.6}{n^2}\ \text{eV}

Energy of the nth hydrogen orbit.

pH = -\log_{10}[H^+]

Acidity from hydrogen-ion concentration.

pOH = -\log_{10}[OH^-]

Basicity from hydroxide-ion concentration.

C_xH_y + \left(x + \tfrac{y}{4}\right)O_2 \rightarrow x\,CO_2 + \tfrac{y}{2}\,H_2O

Complete combustion of a hydrocarbon in oxygen, releasing energy and producing carbon dioxide and water.

Q = -KA\frac{\Delta h}{L}

Rate of groundwater flow through porous rock.

pH = -\log_{10}[H^+]

Acidity from hydrogen ion concentration.

T = \frac{n+1}{m}

The average interval between floods of a given size (Weibull plotting position).

P = 1 - \left(1 - \frac{1}{T}\right)^{n}

Chance of experiencing at least one flood of return period T over n years.

Q = C\,i\,A

Estimates peak stormwater discharge from a catchment.

V = \frac{1}{n}\,R^{2/3}\,S^{1/2}

Average velocity of water flowing in an open channel or river.

Q = A\,v

Volume of water flowing past a point per unit time.

Fr = \frac{v}{\sqrt{gL}}

Ratio of inertia to gravity waves; governs hull resistance.

P = \rho g Q H \eta

Power from falling water: flow rate times head.

P = 0.052 \times MW \times TVD

Bottom-hole pressure from mud weight and depth in oilfield units.