Toplinsko širenje čvrstih tijela - 1.

$l_0=l_t(1+\beta t)l\_\{0\}=l\_\{t\}(1+\backslash beta\; t)$

$l_0=l_t(1+\beta T)l\_\{0\}=l\_\{t\}(1+\backslash beta\; T)$

$l_t=l_0(1+\beta t)l\_\{t\}=l\_\{0\}(1+\backslash beta\; t)$

$l_t=l_0(1+\beta T)l\_\{t\}=l\_\{0\}(1+\backslash beta\; T)$