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H conversions

H = magnetic coercive force, AT/m

= NI/L

= Magn. Int.

= A turns/m

= field strength

= magnetizing force (oersteds)

= Amp turns/meter

= magnetic intensity

H = Enthalpy

= U + PV

= E + PV

= G + TS

= - spontaneous

H = Heat (watt-seconds)

= I²Rs

Ĥ = H_mean

ΔH = ΔU + PΔV (P,V work only)

= ΔU + VΔP (P,V work only)

= q_P,V (P,V work only)

= + endotherm.

= - exotherm.

= 0 (isotherm., Id. g., ΔU=0, expans., contract, mix)

< 0 (ΔG<0, ΔS>0)

= T´ΔS (prohibitive T)

= ΔG + TΔS (const P)

< TΔS (ΔH>0, ΔS>0)

< 0 (ΔS>0, any T)

< 0 (ΔS<0, low T)

> 0 (ΔS>0, high T)

> 0 (ΔS<0, prohib., nonspontaneous)

= TΔS (const. T,P, PV work only, equil.)

= Σ H_prod - Σ H_react

= ΔU + ΔnRT_gas

= q

= nΔĤ

= ΔE + Δ(PV)

= q - w + P_opp(ΔV)

= q_P

= ΔE + P_oppΔV

≈ ΔE

= -ht_Rx/g (limit reactant)

= nCpΔT

ΔH (298) ≈ T_eqΔS (298)

ΔĤ = ΔE +Δn_gasRT

ΔH^θ = ΔG^θ + TΔS^θ (equil., st. cond.)

│ΔH│>│TΔS│ (ΔH<0, ΔS<0)

ΔH₁ = A + B → C

ΔH₂ = -D + E → C

ΔH₃ = A + E → D

ΔĤ⁰_F = amount of heat used or released in form. / mole/ 298⁰K /from elements

ΔH_Rx = n[ΔH_vap + C_PΔT] (liquid to gas)

ΔH⁰_Rx = Σ_Prod.nΔĤ⁰_F - Σ_Reac.nΔĤ⁰_F

ΔH⁰_Rx = ΔG⁰_Rx + TΔS⁰_Rx

ΔH_sys = ΔG_sys + TΔS_sys

= -TΔS_surr

ΔH_vap = q_rev. (P,V, work only, T_b)

= T_bΔŜ_vap (const. P) (ΔS = 21 cal./mol K Trouton)

≈ 88 JT_b/mol ∙ K (const. P)

ΔH_tr = T_tr.ΔS_tr. (rev., equilibrium)

ΔĤ_tr = T_tr.ΔS_tr/n

= q_{rev. tr./}n

ΔĤ_vap =TΔŜ_vap

ΔĤ_melt = T_meltΔŜ_melt

H⁺ = hydrogen ion

[H⁺] = 10^-pH

= 1 ∙ 10^-7 M (pH = 7)

= k_a([HX]/[X^-]

≈ k_a(c_a/c_b)

[H⁺]_water = [OH^-]

= 1.00 ∙ 10^-7 M @ 25 ⁰C

= 1.6218 ∙ 10^-7 mol/L @ 310⁰K

h = altitude

h = Planck's constant

= 6.6262 · 10^-34 Js

= E/ν

hν = ∆E

= hc/λ

= B.E. + 1/2mv²

hν - hν₀ = VAsec.

H₂O = 55.5247 mol/L @ 310⁰K

= 18.0152 g/mol

H₂O liquid = 0-100 ⁰C

= 32-212 ⁰F

H₂O ft³ ≈ 62.4 lbs

= 22.4 L

H₂O heat of fusion = 80 cal.

H₂O heat of vaporization = 540 cal.

H₂O density = 8.34 lb/gal

/H₂O_(dissoc.) = [OH^-]/[H₂O]

= [H⁺]/[H₂O]

hah-chee (Jap.) = eight

halb (G.) = half

half = 1/2

= .5

= hemi (Gr.)

= demi (F.)

= deuxieme (F.)

= emisys, -eia, -y (Gr.)

= halb (G.)

= Halfte (G.)

= misos (Gr.)

= se (L.)

= semi (L.)

Halfte (G.) = half

hand = 4"

haon-deug = eleven

Hct = hematocrit

≈ 45% total blood vol.

= B-cell V/B-vol

Heat = random kinetic molecular energy of matter

= q

= Ht cap. ∙ T

= Ω ∙ A² ∙ s

Heat_specific = amount of heat required to raise temp. of 1 gram of a substance 1 ⁰C

Heat Capacity = C

= Heat/nT

hectare = ektarion (Greek)

= 100 ares

= ha

hectogram = 10 dekagrams

= 100 g

= hg

hectoliter = 10 dekaliters

= 100 L

= hl

hectometer = 10 decameters

= 100 m

= hm

height = aden

= ard

helix = spiral

hematite = lodestone

hemi (Gr.) = half

hemina = pt (Eng)

= 1/2 sextarius

hen (Gr.) = one

Henry = H

Hertz = Hz

hex (Gr.) = six

highest = akros

hin = 2 choas,

= 2 conguises

= 12 sextarii

hogshead = 2 barrels

= hhd

horsepower = hp

hour = hora

= day/24

= 60 min.

hp = horsepower

= 33,000 ft lb/min

= 746 watt

= (2P ∙ stroke ∙ A ∙ Rotation)/33,000

= V ∙ eff ∙ I/746

hphr = .746 kwhr

Ht = heat

= Ht. cap. ∙ T

= Ω ∙ A² ∙ s

Ht_Rx = ht. absorb._sol'n + ht. absorb._cal.

Ht_{T (Energy)} = ΔT ∙ C

huit (F.) = eight

huitieme (F.) = eighth

humidity_relative = hum._absolute @ 0 ⁰C/(Gms/m³) @ ⁰C

≈ 100% - 10% /1 ⁰C difference in wet and dry bulb reading

≈ 100% - 5% /1 ⁰F difference in wet and dry bulb reading

hundert (G.) = hundred

hundred = centum (L.)

= cent (F.)

= centenus (L.)

= hundert (G.)

= ekaton (Gr.)

= ekatontas (Gr.)

hundredth = one percent

= centesima (L.)

= centieme (F.)

= ekatostos (Gr.)

hundredweight = 100 pounds

= cwt

hydroxyl ion = OH^-

hysteresis = amt magnetezation of ferrous mat.'l lags magnetizing force because of molecular friction

hysteresis loss = power expended in mag. mat'l as result of mag. hysteresis

= P_h

Hz = Hertz

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