Aire propiedades
Transcript of Aire propiedades
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propiedadespropiedades
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o aire ocupa un espazo
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Ninguén é capaz de inflar un globo metido nunha botella.
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Se facemos un burato na botella podemos inflar o globo.
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O aire que hai dentro da botella non deixa que
entre a auga.
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soprando nunha garrafa con auga podemos medir a capacidade pulmonar
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o aire pódese comprimir
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AO
Ao deixar de exercer forza o émbolo da xeringa volve ao punto inicial
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cos cambiosde temperaturavaría o volume
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o aire quente ocupa máis espazo
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ao quentarse o aire dentro do
tubo de ensaio fai que o líquido suba polo tubo interior
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Énchese unha botella con auga quente
baléirase Tápase cun globo
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Arrefríase a botella con auga
ao baixar a temperatura do aire dentro da botella o globo vaise
para dentro
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o aire ten masa
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Pesa máis un globo cheo de aire que baleiro
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o aire fai forza
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O aire opón resistencia na superficie do
paracaídas e fai que caia lentamente.
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Coa metade do peso cae máis a modo.
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A forma do avión fai que o aire opoña menos resistencia ao desprazamento. O empuxe do aire cara arriba fai que se
manteña un tempo suspendido.A forza de lanzamento faino avanzar.
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Resistencia do aire
empuxe
Forza de lanzamento
peso
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a enerxía do aireproduce
desprazamentos
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O vento empuxa sobre a superficie das velas e produce desprazamentos horizontais.
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O vento empuxa sobre a superficie das pás unidas a un eixo e produce movementos xiratorios.
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o aire quente pesa menos e desprázase
cara arriba
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O aire quente fai subir o papel que se queima.
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o aire quente forma correntes
ascendentes
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o aire exercepresión
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A presión do aire empuxa a membrana elástica.CONSTRUÍMOS UN BARÓMETRO CASEIRO
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A presión do aire empuxa a cartulina e non deixa caer a auga
Se deixamos entrar aire dentro do vaso a auga cae.
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A forza que fai o aire para entrar no tubo é máis grande que o peso da auga, por iso a auga non sae do tubo.
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Se deixamos entrar aire dentro do tubo a auga sae.
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Se tapamos a pipeta pola parte de arriba a presión do aire
impide que saia a auga.
Se a destapamos a presión do aire equilíbrase e a auga pode
sair.
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A forza que se exerce no émbolo dunha xeringa empuxa polo émbolo da outra.
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Ao saltar sobre unha botella o aire a presión lanza a bola.
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o aire ten humidade
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Ao enfriar o aire quente que hai dentro dunha botella a humidade que contén condénsase nas
paredes de vidro.
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Enchemos unha botella con auga quente
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Así imitamos a formación das nubes
Baleirámola as ¾ partes e cubrímola con xeo
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D e partam e nto
d e C ie ncias
1 E S O A, 201 0º