What is the density of hollow blocks?

density = mass/ SOLID volume of the block (not including the hollow volume ) 

Density is a constant for any size of block of same material . Anyway , size of hollow concrete block490mm x190mm x90mm.

pl specify the block size/thickness/mass???

 

there is standard size is 400*200*190 mm as i know..

 

as per this this2140kg/m3......