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1m=100cm 1m³=100cm*100cm*100cm=1000000cm³
7800kg/m³=7800*1000g/1000000cm³=7800000g/1000000cm³=
=7,8g/cm³
2)1dag=10g
1dm=10cm
1dm³=10cm*10cm*10cm
1dm³=1000cm³
90dag/cm³=90*10g/1000cm³=900g/1000cm³=0,9g/cm³
3)1kg=1000g
1dm³=1000cm³
0,8kg/dm³=0,8*1000g/1000cm³=0,8g/cm³
4)1dag=10g
1dm=10cm
1dm³=1000cm³
2,15dag/dm³=2,15*10g/1000cm³=2,15g/100cm³=
=0,0215g/cm³
Zelazo- 7 800 kg/m3 = 7,8 g/cm3
bo: 1kg =1000g,
1m =100cm,to 1m3 =100*100*100cm3 =1000 000 cm3
2.Lód - 90 dag/dm3 = 0,9 g/cm3
bo - 90 dag = 900g
dm3 = 10cm*10cm*10cm =1000 cm3
3)Drewno dębowe - 800 kg/m3 = 0,8 g/cm3
4)Platyna - 2,15 dag/cm3 = 21,5 g/cm3, bo 2,15dag =21,5g
(Pamiętaj o jednostkach podstawowych w pierwszej potędze,to
dalej pójdzie łatwo - pozdrawiam).