youtor.org
Thermal expansion physics experiment
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Video Source: www.youtube.com/watch?v=PzNvJ09u_WQ
http://www.fizik.si • Thermal expansion is the tendency of a matter to change in volume in response to a change in temperature. When a substance is heated, its constituent particles begin moving and become active thus maintaining a greater average separation. Most objects stretch when they are heated and shrink when cooled down. But there are also some exceptions, which stretch when they are cooled down in a certain temperature range and they shrink when they are heated; for example: water between 0°C and 4°C or iron - platinum alloy. Metal stick stretches most in length while warming. As extension is so small that it is hardly noticed. We can help us with a pointer on a free edge of a stick. The other edge of a stick is fixed, so that while heating the stick stretches towards the pointer and slowly moves it. This is physics experiment for science project. • http://www.fizik.si • Večina teles se raztegne, ko jih segrejemo in skrči, ko jih ohladimo. Obstajajo pa tudi nekatere izjeme, ki se na določenem temperaturnem območju raztegnejo, ko jih ohladimo, in skrčijo, ko jih segrejemo, na primer voda med 0°C in 4°C ali zlitine platine in železa. Kovinska palica se pri segrevanju najbolj razteza v dolžino. Ker je raztezek zelo majhen, ga težko opazimo. Zato si pomagamo s kazalcem na prostem koncu palice. Drug konec palice je pritrjen, tako da se palica pri segrevanju razteza proti kazalcu in ga počasi premika.
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