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Newton's Gravity Glass



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Newton's Gravity Glass

A Great Gift and Interesting Educational Tool!

Newton's Gravity Glass is a sand-filled "hourglass" suspended within a liquid-filled glass cylinder. The sand is a dark blue color making it highly visible. The liquid is an alcohol-water mixture accented with light-catching glitter.

The Gravity glass is an awesome desk-topper and a question-generating eductional tool. When the cylinder is flipped, the sand within the hourglass moves down while the hourglass itself floats up.

The cylinder is made of hand-blown glass. The unit measures 8.75" high x 1.54" in diameter.

Gravity glass comes in blue, purple and red (or choice)

Buy two or more and save 10%



Gift Wrap Available


Item #DescriptionPriceQty
3081980Newton Gravity Glass

In stock and ships immediately
1
2+
$12.95
$11.66





Customer Reviews
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 -  Wednesday, May 23, 2007
Missed the Point
Reviewed By: James G. Gasper (San Diego, CA)
This item is quite pretty, but whoever manufactured it completely missed the point. The original curiosity was somewhat confounding: When you see the item at first: the hour-glass is at the top of the enclosed cylinder, with all of its sand at the bottom of the hour glass. When you invert the device, the hour-glass stays at the bottom for a while, while the sand transfers to the bottom. At some point, the hour glass begins to rise to the top of the cylinder. Why? This one does not function like this.

 -  Saturday, January 24, 2009
Bad Manufacturing
Reviewed By: Jim (Dublin, CA)
I guess what is supposed to happen is the hour glass should rise up the glass cylinder as the sand falls to the bottom, however the air in the cylinder lifts it quickly to the top. The first one came shattered, the second one, filled with air. Also, the hour glass doesn't seem to work properly- the grains are too coarse and get clogged in the neck.

 -  Tuesday, January 01, 2008
Doesn't work
Reviewed By: Lowell Rasmussen (Framingham, MA)
The performance does not match the description in the catalogue. When inverted the air in the liquid filled cylinger acts like a lifting cushion on the hourglass. The hourglass is rapidly pushed to the top. The sand will fall to the bottom of the hourglass but then nothing else happens. Not a large mystery as to why it rises. I believe it is poor manufacturing to have so much air included in the cylinder.


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