A água sobe? Capilaridade da água
Autor: Rafael Arenhaldt | Publicado: 2010-11-02T16:54:00-07:00

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GISELE MAURILDA DOS SANTOSLUANA PORTILLA DE MELLO
ROTEIRO DO EXPERIMENTO: A ÁGUA SOBE? CAPILARIDADE DA ÁGUA&nbsp;OBJETIVO&nbsp;O objetivo deste experimento é de criar condições para que o aluno conheça a ação da capilaridade, ou seja, a elevação espontânea da água por espaços estreitos.MATERIAIS E REAGENTESÁgua
2      potes de plástico transparente
Tira      de tecido
Terra
Balde
Palito
&nbsp;PROCEDIMENTO
Colocar      água e terra em um dos potes e misture com um palito.
Deixe      o balde de ponta-cabeça.
Coloque      uma ponta da tira do pano no pote com água misturada com terra e ponha no      pote esse em cima do balde de ponta-cabeça.
Coloque      a outra ponta da tira em um pote vazio.
Depois      de algum tempo, questione os alunos sobre o que está acontecendo?
QUESTÕES&nbsp;
1. O      que aconteceu?&nbsp;2. Qual      a propriedade da água que este experimento apresentou?&nbsp;3. Como      acontece a ação de capilaridade da água?&nbsp;4. É      possível transportar a água de um pote para o outro sem despejá-la?
COMENTÁRIOSCapilaridade é a subida (ou descida) de um líquido através de um tubo fino, que recebe o nome de capilar. A capilaridade é um fenômeno físico&nbsp; resultante das interações entre as forças de adesão e coesão da molécula de água. É graças à capilaridade que a água desliza por entre poros de alguns materiais, como o algodão ou outro material. Quando se coloca um tubo de fino calibre em contato com água, o líquido tende a subir pelas paredes desse tubo, graças às forças de adesão e coesão. A adesão está relacionada com a afinidade entre o líquido e a superfície do tubo, pois há a formação de ligações de hidrogênio entre os dois. Graças à coesão das moléculas de água, também proporcionada pelas pontes de hidrogênio, elas mantêm-se unidas, e umas acabam arrastando as outras pela coluna, elevando o nível de água.&nbsp;
REFERENCIAL:&nbsp;ÁGUA: livro do professor/ Centro de Pesquisa e Desenvolvimento da Sangari Brasil. 10ª ed. São Paulo: Sangari do Brasil, 2007.