By Hennig Gremmel
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Extra info for Switchgear Manual
686 1019 cm –3. 0000 is the reference quantity for the relative atomic weights of fundamental substances. 38 · 10–23 J · K–1 Boltzmann’s constant: k = —– NA is the mean energy gain of a molecule or atom when heated by 1 K. g. electron or proton) can have. 78 · 10–27 g (MeV)–1 according to Einstein, following E = m · c2, the mathematical basis for all observed transformation processes in sub-atomic ranges. Faraday’s constant: F = 96 480 As · mol–1 is the quantity of current transported by one mole of univalent ions.
Electrolytic potential differences can therefore also occur between metal surfaces which to the engineer appear very little different. Even though the potential differences for cast iron and steel, for example, with clean and rusty surfaces are small, as shown in Table 1-9, under suitable circumstances these small differences can nevertheless give rise to significant direct currents, and hence corrosive attack. Table 1-9 Standard potentials of different types of iron against hydrogen, in volts SM steel, clean surface cast iron, clean surface approx.
G. as recommended in IEC publication 123, are related as follows: for all numerical values above 60 the DIN loudness in DIN phon corresponds to the sound pressure level LB in dB (B), for all numerical values between 30 and 60 to the sound pressure level LA in dB (A). All noise level values are referred to a sound pressure of 2 · 10–5 N/m2. ) Daytime (6–22 hrs) dB (A) Night-time (22–6 hrs) dB (A) 70 65 60 55 50 45 70 50 45 40 35 35 Short-lived, isolated noise peaks can be disregarded. Disturbing noise is propagated as air- and solid-borne sound.
Switchgear Manual by Hennig Gremmel