Experimento 7.pdf

# Experimento 7.pdf - 1 Introdu¸c˜ ao As mudan¸cas de fase...

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1 Introdu¸ ao As mudan¸cas de fase da ´agua se relacionam com a press˜ao e a temperatura da seguinte forma: Figura 1 Veja que, pelo gr´ afico, a 1 atm a ´agua l´ ıquida se solidifica a 0 C e ferve a 100 C , o que ´ e o esperado. Al´ em disso, pelo diagrama ´ e f´ acil ver que, por exemplo, quanto maior a press˜ ao, maior a temperatura necess´aria para fervˆ e-la. Analogamente, quanto menor a press˜ao menor a temperatura de liquefa¸ c˜ao. No experimento trataremos mais especificamente da passagem da ´ agua l´ ıquida para vapor de ´agua: Figura 2: Curva de press˜ ao de vapor Quando come¸ ca o processo de vaporiza¸c˜ ao, as mol´ eculas est˜ ao deixando a superf´ ıcie ıquida e passando para a fase gasosa. Mas, ao mesmo tempo, mol´ eculas que est˜ ao no estado gasoso colidem com a superf´ ıcie do recipiente e voltam ao estado l´ ıquido. Dito isso, podemos falar dos conceitos de vapor saturado e press˜ ao de vapor. Vapor saturado ´ e quando o n´umero de 1

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• Spring '18
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