Chemical refrigerants are assigned an R number which is determined systematically according to molecular structure.Common refrigerants are frequently referred to as Freon (a registered trademark of DuPont).hemical refrigerants are assigned an R number which is determined systematically according to molecular structure.
Some Rube Goldberg machines. use a complicated series of actions to simply move an object from. one place to another. Any object that is moving, has what is called kinetic energy; giving. an object more speed means giving it more kinetic energy.
For example, the energy $2E_2$ can be reached for two $\frac12$ particles only one way, $a$ = energy $E_2$, spin up, $b$ = energy $E_2$, spin down (or vice versa, which gives the same quantum state). Thus this energy level is nondegenerate.On the contrary, energy $E_1+E_2$ is an eigenvalue for a total of four states: $ 1 a$ = energy $E_1$, spin up, $b$ = energy $E_2$, spin up, $ 2 a$ = energy $E_1$, spin up, $b$ = energy $E_2$, spin down, $ 3 a$ = energy $E_1$, spin down, $b$ = energy $E_2$, spin up.$ 4 a$ = energy $E_1$, spin down, $b$ = energy $E_2$, spin down.n the case of spin $\frac12$, we prepare boxes corresponding to single-particle energies $E_1$, $E_2$, $E_3$, and $E_4$. We can put in two fermions in the following ways: $(\ 1 uparrow \downarrow), (\ \), (\ \), (\ \)$ ... 2  energy $2E_0$, degeneracy 1.