The conversion only gets tricky with the cubed labels. Keep in mind that cm^3 is cm*cm*cm, and that m^3 is m*m*m, AND that there are 100 cm in 1 meter. Here's how the conversion will look if we expand it to make it simple to understand: [tex]2.5 \frac{g}{cm^3} * \frac{1kg}{1000g} * \frac{x100cm*100cm*100cm}{m*m*m} [/tex]. If we do all that multiplying and dividing, and all the crossing out of the labels that cancel, we get [tex]2500 \frac{kg}{m^3} [/tex]. There you go!
