Post on 02-Apr-2022
2
Why does fiber glass not shrink as much as a pure plastic on
cooling?A. It has no plastic in itB. Glass shrinks very littleC. It is magic
Tensile Stress
Yield Stress
Reduction in AreaElongation
Annealed
4
Electrons as a Ideal Gas
and
but
Wiedemann-Franz-Lorentz Law
With quantum treatment
Real values agreeLorenz number in 10^-8 Watt ohm/K^2
Metal 273K 373K
Ag 2.31 2.37
Au 2.35 2.40
Cd 2.42 2.43
Cu 2.23 2.33
Ir 2.49 2.49
5
Moremetals
Mo 2.61 2.79
Pb 2.47 2.56
Pt 2.51 2.60
Sn 2.52 2.49
W 3.04 3.20
Zn 2.31 2.33
The Wiedemann-Franz-Lorentz works because
A. Heat and electrical current are carried by the same objects in many materialsB. On a quantum level, everything is the sameC. The mechanism for impeding heat and electrical currents are the same in many materials