Paschen's equation Formula

Equation for calculate paschen's equation is,

V_b = B*p*d / [[ In( A*p*d ) ] - [ln (In ((1 + 1/V_b ) ) ]]

where,
B - Constant that depends on the surrounding gas (V/atm*m)
p - The pressure of the surrounding gas (atm)
d - The gap distance (m)
A - Constant that depends on the surrounding gas (1/atm*m)
γ_se - Secondary Electron Emission Coefficient (dimensionless)
V_b - The breakdown potential