Answer:
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 thestandardfluid and take the weight. thedifrencbetwen last two w wl givethe wt of standard fluid. Secondwt minuswt offluid will giv the vlumeof sampl a you knowthe wt of sampl so you can calclate th ensity