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Void ratio is defined as the ratio of the volume of the void space compared to the volume of the solid particles.
The Void - 2014 Welcome to the Void 1-1 was released on:
USA: 4 May 2014
40:1 is the original requirement but the Echo universal 50:1 oil can run it as well and will not the void any warranty.
Volume of voids divided by Volume of solids