Prvi zakon termodinamike - 1.

$\mathrm{\Delta }U=Q-W\backslash Delta\; U=Q-W$

$\mathrm{\Delta }U=\mathrm{\Delta }Q+W\backslash Delta\; U=\backslash Delta\; Q+W$

$\mathrm{\Delta }W=\mathrm{\Delta }Q-U\backslash Delta\; W=\backslash Delta\; Q-U$

$\mathrm{\Delta }Q=U-\mathrm{\Delta }W\backslash Delta\; Q=U-\backslash Delta\; W$