Explicație pas cu pas:
[tex]1 \: g = {10}^{ - 3} \: kg[/tex]
[tex]1 \: {cm}^{3} = {10}^{ - 6} \: {m}^{3} [/tex]
[tex] \frac{225\: g}{250\: {cm}^{3} } = \frac{225\cdot {10}^{ - 3} \: kg}{250\cdot {10}^{ - 6} \: {m}^{3}} = \frac{9\cdot {10}^{ - 3} \: kg}{10\cdot {10}^{ - 6} \: {m}^{3}} = \\ = \frac{9\cdot {10}^{ - 3} \: kg}{{10}^{ - 5} \: {m}^{3}} = 9\cdot {10}^{2} \:kg/{m}^{3} = 900\:kg/{m}^{3}[/tex]
