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WHSV是质量空速（ml/g/h）；GHSV是体积空速(/h)。 他们单位是不一致的。 对于质量空速比较简单只需知道催化剂质量就可以了；但是对于体积空速通常需要测量催化剂堆体积（或堆密度；然后根据质量进行计算）。

体积空速又分为气时空速(GHSV)和液时空速(LHSV)。 GHSV即Gas Hourly Space velocity，其定义是：单位时间(小时)流经单位体积催化剂的气体体积量，即GHSV=V(gas)/[V(cat.)*time(h)]。为了修正温度、压强对体积的影响，也可以将气体体积换算为STP条件下的体积。

体积空速：每小时进料的体积（液体（lhsv）或气体（ghsv））/催化剂的装填体积; 重时空速（whsv）：每小时进料的重量（液体或气体））/催化剂的装填重量 空速的计算公式：

2015年2月1日 · Gas hourly space velocity (GHSV) = Volumetric flow rate of reactant or exhaust gas/External volume of catalyst monolith. For a cylindrical section, volume of catalyst monolith = pie.r2.h...

As the Liquid Hourly Space velocity (LHSV) is the ratio of the volumetric flow rate (hourly) of the liquid feed to the volume of the catalyst present in the reactor. So, LHSV is reciprocal of the space-time. Reducing LHSV generally results in an enhancement of the hydrotreating reaction.

GHSV (gas hourly space velocity) =(volumes of feed as gas at STP/hr)/(volume of the reactor or its content of catalyst)

体积空速又可分为两种情况：如果反应物为气体，可用气体空速(Gas hourly space velocity，GHSV)(注意此时气体体积是标准状态下的体积)；如果反应物为 液体，则可用液时空速(Liquid hourly space velocity，LHSV)。

2013年1月1日 · A parametric study taking into account gas hourly space velocity (GHSV) and methane to oxygen ratio for the oxidative coupling of methane (OCM) is applied. The GHSV and methane to oxygen ratio are shown to effect the methane conversion and selectivity towards ethane and ethylene.

The gas hourly space velocity (GHSV) is used to relate the volumetric flow rate to the catalyst volume. GHSV has units of inverse hour and is defined as the volume flow rate per catalyst volume. The reactor feed may be preheated and the feed pressure may alter.