For a tubular reactor with space time ‘η’ and residence time ‘ζ’, the following statement holds good ?
A. Η and θ are always equal
B. Η = θ, when the fluid density changes in the reactor
C. Η = θ, for an isothermic tubular reactor in which the density of the process fluid is constant
D. Η = θ, for a non-isothermal reactor
