The volume of 1kg of platinumis $(1000/21.45){\mathrm{cm}}^3$, that is approximately $50{\mathrm{cm}}^3$. So 1tonne of platinum has an approximate volume of $50,000{\mathrm{cm}}^3$, or $1/20m^3.\mathrm{So}\mathrm{about}$5m^3 $\mathrm{of}\mathrm{platinum}\mathrm{is}\mathrm{produced}\mathrm{per}\mathrm{year},\mathrm{and}\mathrm{so}\mathrm{the}\mathrm{total}\mathrm{volume}\mathrm{ever}\mathrm{produced}\mathrm{is}$250m^3 measuring 10m5m5m,which issimilar to the size of a house.