Plastic measuring cylinder non-conventional method to measure the density of solids by various metho

Unconventional methods to measure the density of solids in a variety of ways

Balance, measuring cylinder (or measuring cup) are two common tools for measuring density, but sometimes subject to the limitations of the experimental conditions or lack of cylinder (or measuring cup), or lack of balance, or even two kinds of equipment are not available, then how to measure the density of solids? The following examples combined with the classification of the description.

A. Lack of balance class

Equipment provided with a measuring cylinder (or measuring cup), may wish to use the "liquid" method to measure its volume, and taking into account the object floating, and V row can be measured using a measuring cylinder, so that it can be found.

Example 1. you are given a measuring cylinder, an empty glass tube, enough water, how to measure the density of the empty glass tube?

Solution: (1) in the measuring cylinder filled with an appropriate amount of water, note down the scale V1 reached by the water surface.

(2) the small test tube mouth up gently into the measuring cylinder, so that it floats on the surface of the water in the cylinder, at rest, write down the scale reached by the water V2, the gravity of the glass tube;.

(3) the small test tube into the water so that it is filled with water and then sink to the bottom of the measuring cylinder, write down the water surface to reach the scale V3.

(4) The density of the glass .

If the given solid material directly in a liquid of known density (such as water) can not "float", we can take measures to make it "float". For example, play dough directly into the water sink, but if you pinch it into a bowl, you can float; toothpaste skin in the water sink, but if you try to make it hollow and seal its mouth can float ...... For solids like stones, metal blocks and other densities greater than the known density of the liquid and not deformable, and how to make it "float" it? Can make the density of objects less than the density of the liquid (such as wood blocks, foam, plastic, etc.) as props, see Example 2 for details.