# Is There Any Difference Between Strong Quarks Force and Strong Nuclear Force?

the spectrum of quarkonium and the comparison with positronium potential for the strong force is:

$V(r) = - \frac{4}{3} \frac{\alpha_s(r) \hbar c}{r} + kr$

(where the constant $k$ determines the field energy per unit length and is called string tension. )

in other hand, one can talk about a Yukawa potential of the form

$$V(r) = - \frac{g^2}{4 \pi c^2} \frac{e^{-mr}}{r}$$

where $m$ is roughly the pion mass and $g$ is an effective coupling constant.

-