{"product_id":"radiometer-glass-crookes-75mm-top-130mm-height","title":"Radiometer, Glass, Crookes, 75mm Top, 130mm Height","description":"The GSC International 7-1113 Radiometer is a Crookes-style glass instrument that provides a striking visual demonstration of radiant and thermal energy transfer. Measuring 130mm in height with a 75mm glass bulb, it features four vanes—each with one black side and one silver side—mounted on a spindle inside a partial vacuum.\u003cbr\u003e\u003cbr\u003eWhen exposed to light or heat, the black side absorbs more energy than the silver side, creating a temperature difference that sets the vanes in motion. This rotation illustrates the principles of thermal transpiration and molecular movement, offering a hands-on way to teach energy conversion.\u003cbr\u003e\u003cbr\u003ePerfect for physics classrooms, science fairs, or homeschool environments, the radiometer also reacts to hot and cold water exposure—spinning faster in warmth and slowing in cool conditions. It's a captivating tool for reinforcing heat transfer, energy absorption, and gas behavior in a low-pressure environment.","brand":"GSC International","offers":[{"title":"Default Title","offer_id":49956269031701,"sku":"GSC7-1113","price":42.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0857\/4897\/3845\/files\/7-1113-_3_Radiometer-Photoroom.jpg?v=1780893499","url":"https:\/\/unitedsupplycorp.com\/products\/radiometer-glass-crookes-75mm-top-130mm-height","provider":"United Supply Corp.","version":"1.0","type":"link"}