# Blast Scaling Constant of Proportionality(Z)

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"Constant of Proportionality(Z)" =
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cataustria.Blast Scaling Constant of Proportionality(Z)
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The Blast Scaling Constant of Proportionality computes the dimensional parameter that is used as a scaled distance. Many States use rules based upon the explosives, their quantity, and the distance from the explosive to where people are at risk.  These rules are known as Quantity-Distance (Q-D) criteria, and are based on the approach derived from the Hopkinson-Cranz Scaling Law, which is further amended by a range of coefficients.  It is the basis of much of the work on the estimation of appropriate quantity and separation distances.

### Examples of constants used in the field:

8.0 - Used to predict separation distances between ammunition process buildings (APB) within an explosive storage area (ESA). Additionally minimum safe distances further apply if R is below a certain level, which differs for each ‘Z’ function.

14.8 - Used to predict separation distances between an explosive storehouse (ESH) and a public traffic route with civilian access.

22.2 - Used to predict separation distances between an explosive storehouse (ESH) and a building inhabited by civilians.

44.4 - Used to predict separation distances between an explosive storehouse (ESH) and a vulnerable building inhabited by civilians (e.g. a school).