Chemical Reaction Engineering
A space velocity of 5 hr⁻¹ means that

Cent per cent conversion can be achieved in at least 5 hours
Five reactor volumes of feed (at specified conditions) are being fed into the reactor per hour
A fixed conversion of a given batch of feed takes 5 hours
After every 5 hours, reactor is being filled with the feed

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Chemical Reaction Engineering
The reactions of high molecularity are rare, because

Many body collisions are not favoured energetically
Of very large activation energy of many bodies
Of low probability of many body collisions
Of requirement of very large concentration for such reactions

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