The sink-float method is often used to identify the type of glass material found at crime scenes by determining its density.
several different types of glass of known density are placed into solutions of varying densities. determine whether each glass
piece will sink, float, or do neither when immersed in the given solution.
glass that will sink
glass that will float
glass that will not sink or float
alkali zinc borosilicate with a density of
2.57 g/ml in a solution with a density
of 2.46 g/ml
soda borosilicate with a density of 2.27 g/ml
in a solution with a density of 2.62 g/ml
alkali strontium with a density of 2.26 g/ml in
a solution with a density of 2.34 g/ml
potash borosilicate with a density of
2.16 g/ml in a solution with a density
of 2.16 g/ml
potash soda lead with a density of 3.05 g/ml
in a solution with a density of 1.65 g/ml
answer bank
terms of use
contac

Glass that will sink

Glass that will float

Glass that will not sink or float

Explanation:

Density is the property of matter that states the ratio of the amount of matter, its mass, to the space occupied by it, its volume.

So, the mathematical expression for the density is:

By comparing the density of a material with the density of a liquid, you will be able to determine whether object will float, sink, or do neither when immersed in the liquid.

The greater the density of an object the more it will try to sink in the liquid.

As you must have experienced many times an inflatable ball (whose density is very low) will float in water, but a stone (whose denisty is greater) will sink in water.

The flotation condition may be summarized by:

Glass that will sink

Glass that will float

Glass that will not sink or float

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).