Termoscópio
Autor: Joaquim Francisco Pereira | Publicado: 2011-06-06T00:24:00-03:00






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Aquecendo o vidro com a mão, ocorre uma transmissão de calor e o ar contido em seu interior sofre uma expansão (aumento de volume) empurrando a coluna de líquido para baixo. &nbsp;A situação é análoga quando o ar de dentro do vidro é resfriado: seu volume diminui (sofre contração), fazendo com que o líquido suba no tubo. Quando é estabelecido o equilíbrio térmico o líquido para de movimentar.O funcionamento de um termômetro de mercúrio ou álcool é baseado no princípio da transmissão de calor. Quanto o termômetro entra em equilíbrio térmico com o corpo, a coluna de líquido em seu interior se estabiliza, indicando a temperatura do corpo.