gases

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Projeto Rumo ao ITA Página 1 Os gases tem uma importância muito grande na prova do ITA, principalmente por essa teoria ser a base d o estuda da Termodinâmica. Daremos maior ênfase nesse material na parte básica que envolve os gases, começando com as definições das funções de estado e depois partindo para os principais resultados obtidos pelos cientista ao longo da história. 1. Os conceitos fundamentais a) Pressão A pressão é definida como sendo a força aplicada a uma unidade de área. Logo, podemos expressar a pressão da seguinte forma: P= F A Quando nos referimos aos gases, entende-se por pressão como sendo a força média que as partículas gasosas exercem no recipiente em que esse gás se encontra e dividindo essa força pela área da superfície. A letra utilizada para representar a pressão será o P. b) Volume O volume de um gás é o espaço ocupado por suas moléculas. A letra utilizada para representar o volume será o V. Na prática, as pa rtícula gasosas ocupam todo o es paço do recipiente em que ele se encontrar. Gases Gabriel José Guimarães Barbosa

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