{"product_id":"thermocolour-sheet-25-to-30c","title":"Thermocolour Sheet - 150 X 150Mm","description":"\u003cp\u003eThese thermochromic sheets change colour when influenced by changes in temperature, demonstrating a difference in temperatures and providing an exciting way to see thermal mapping changes through colour. The sheets can be used from Key Stage 1 all the way through to Key Stage 4 to demonstrate, Conduction, Insulation, Convection, Radiation and Friction, plus many other experiments involving temperature change.\u003c\/p\u003e\u003cp\u003eThe sheets are printed on one side with Thermochromic Liquid Crystal, and have a black backing on the other side. The colour change of the TLC can be viewed through the clear uncoated side of the sheet. The sheets come with a pressure sensitive adhesive backing and the protective release liner can be removed for easy adhesion to a variety of flat services. The thermocolour sheets turn from black to red at a given temperature and, as the temperature is increased, pass through the colours of the visible spectrum in sequence before turning black again at a higher temperature. The colour changes are reversible and on cooling the colour change sequence is reversed.\u003c\/p\u003e\u003cp\u003eLiquid Crystals are organic chemicals with twisted helical molecular structures, which expand, or contract with increases or decreases in temperature, not unlike a spring. The result is different wavelengths of incident light being reflected from the slightly changing structure, which our eyes see as changing colours. The sheets can be made in a variety of temperature ranges but the most common temperature used in school science projects is 25°C and has a 5°C band-width of green. These sheets can be used in a wide variety of Science experiments. Liquid Crystal is highly accurate in its temperature reading and completely safe to use in the classroom.\u003c\/p\u003e\u003cp\u003eThe sheet size is 150 mm x 300 mm however you can cut the sheet as most experiments can be conducted using much smaller pieces.\u003c\/p\u003e","brand":"Unbranded","offers":[{"title":"Default Title","offer_id":51274692624667,"sku":"CP00059115","price":21.24,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0915\/4363\/4203\/files\/thermocolour-sheet-150-x-150mm-7518393.jpg?v=1773593891","url":"https:\/\/abcschoolsupplies.co.uk\/products\/thermocolour-sheet-25-to-30c","provider":"ABC School Supplies ","version":"1.0","type":"link"}