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 color making it highly visible. The liquid is an alcohol-water mixture. This is a 2 minute timer.
The Gravity glass is an awesome desk-topper and a question-generating educational 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" high x 1.54" in diameter.
*Note: color of sand will vary.