Planck suggested the correction of the form

[math] E=m_oc^2 + PV[/math]

To this I add, it may even be possible underthe total pressure

[math] E=m_oc^2 + int (P' - P) dV [/math]

It became apparently fortuitous that under the ideal gas laws or a photon gas meant To serve an alternative interpretation the relationship of the volume and mass to its latent energy. The photon gas law plays a direct role as

[math] E=m_oc^2 + PV = m_oc^2 + 3/2[sigma(4)/sigma(3)] Nk_BT[/math]

This further equivalates to

[math] E=m_oc^2 + 3/2[sigma(4)/sigma(3)]Nk_BT = m_oc^2 + 4/3 Int(U/T) dV = m_oc^2 + nRT[/math]

With (R ) being the gas constant.

**Edited by Dubbelosix, 25 September 2019 - 09:30 PM.**