Student Radiometer

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Crooke's Radiometer



> This is our most affordable Radiometer, great for students, classroom demonstration and as a fun & interesting scientific conversation piece. The Crooke's Radiometer was the first heat engine. Originally developed in the mid-nineteenth century by Sir William Crookes, he used the device to measure the intensity of sunlight. Crookes thought it was the 'pressure' of the sunlight that made the Radiometer work. Actually, it was the infrared energy in sunlight that made the vanes turn. Inside the Radiometer there are four vanes, each has one blackened side and one silvered side. It is encased in a clear glass bulb at very low air pressure, which allows the air molecules move about more easily. The different colors on either side of the "vane blades" create the convection currents and that causes the blades to spin when exposed to light or heat. The more intense the light is that shines on it, the faster the vanes inside will turn. With bright light shining on it, the vanes will turn at speeds up to 3,000 RPM! The Radiometer is a great tool in demonstrating the power of solar energy.
The Crooke's Radiometer is about 5" high and 3" in diameter.

Looking for a more upscale/high quality Radiometer?
See our Precision Radiometer.

Student Radiometer: $14.95


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  • Shipping Weight: 0.5lbs

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