Mute
Com.Ciência.Gaia
Você já percebeu que muita gente fala “ar puro”… mas, cientificamente, o ar NÃO é puro? E isso não é opinião: é definição química. Uma substância pura é formada por apenas um tipo de substância química, como oxigênio gasoso (O₂) puro, nitrogênio puro ou água destilada pura. Já o ar atmosférico é uma mistura homogênea de vários gases diferentes. Em média, o ar seco da atmosfera terrestre possui cerca de 78% de nitrogênio (N₂), 21% de oxigênio (O₂) e aproximadamente 1% de outros gases. Esse 1% p
Follow
16
0
6
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