Sachs Scaling is a form of explosive scaling law used to relate the effects of an explosive charge (like pressure, impulse, or damage) at different sizes and distances. It helps predict how an explosion will behave when the size of the charge changes.  In the case of blast waves from explosions produced at altitude, where ambient conditions can be very different from those at sea level, the most commonly used scaling law is that due to Sachs The application of the Sachs scaling law leads to the formulation of altitude scaling factors.

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Sachs Scaling Functions

• Scaled Distance at Altitude: Computes the scaled distances using the Sachs Scaling Law based on the ambient pressure and pressure at a specific altitude.
• Scaled Pressure at Altitude: Computes impulse using the pressure at a specified altitude and the ambient pressure.
• Scaled Impulse at Altitude (v1): Estimates the scaled impulse of an explosion at a specified altitude based on the temperature and pressure at the altitude and the ambient temperature and pressure. 
• Scaled Impulse at Altitude (v2): Estimates the scaled impulse of an explosion at an altitude based on the temperature and pressure at the altitude and the ambient temperature and pressure. 

These functions help you

• Compare blast wave parameters (like pressure or arrival time) from explosions of different sizes.
• Predict effects (like damage or overpressure) for a larger or smaller charge if the effects from a known charge are available.
• Design experiments or weapon systems efficiently by simulating larger blasts using small charges.

Resource:

• "Formulae for Ammunition Management." International Ammunition Technical Guideline. 1st ed. New York: UN, 2013. 2-3.UN SaferGuard. United Nations Office for Disarmament Affairs (UNODA), 20 May 2013. Web. 12 June 2015. <http://www.un.org/disarmament/convarms/Ammunition>.