In a density botle volume is cnstant. take the weight ofbotlewith lid. Tke the wt ofbottleand lidfilled with astandad fluid likewater. In empty botletakethe sampl anmasure its w. Fill thebottlewith...
You measure the mass and you measure the volume. You divide the mass by the volume. If you have uses International Units then you will get the specific mass or density (kg/l = g/cm2 = g/ml = tons /m3)