RADIOMETER
Part No: 01800
Manufacturer: TEDCO
Stock No: 3555-GF1
SKU No: 215975
Image is for illustrative purposes only. Please refer to product description.
$29.95 CAD
Stock may not be available at all store locations. Inventory quantites can change without notice.
| Burlington | 2 | |
| Cambridge | 2 | |
| Markham | 2 | |
| Mississauga | 2 | |
| Scarborough | 2 |
Experience this sphere powered by the sun!
The vacuum is important to the radiometer's success. If there is no vacuum (that is, if the bulb is full of air), the vanes do not spin because there is too much drag. If there is a near-perfect vacuum, the vanes do not spin unless they are held in a friction-less way. If the vanes have a friction-less support and the vacuum is complete, then photons bouncing off the silver side of the vanes push the vanes, causing them to rotate. However, this force is exceedingly small.
If there is a good but incomplete vacuum, then a different effect called thermal transpiration occurs along the edges of the vanes, as described on this page. The effect looks as though the light is pushing against the black faces. The black side of the vane moves away from the light. This is the case with this radiometer.
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