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Cuál es la diferencia entre la presión absoluta y la presión relativa ?

diferencia entre la presión absoluta y relativadiferencia entre la presión absoluta y relativa

Diferencia entre la presión absoluta y presión relativa.

La diferencia entre la presión absoluta y la presión relativa es que la absoluta es la presión con respecto al vacío (0 absoluto de presión). 
En cambio, la relativa, es la presión en relación con la atmósfera (el 0 de la escala es la presión atmosférica a nivel del mar). 

Presión absoluta = presión relativa + presión de la atmósfera

La presión atmosférica es la fuerza por unidad de superficie que ejerce el aire sobre la superficie terrestre. 
La presión atmosférica en un punto coincide numéricamente con el peso de una columna estática de aire de sección recta unitaria que se extiende desde ese punto hasta el límite superior de la atmósfera.

Instrumentos utilizados para medir la presión absoluta y relativa:
Los instrumentos que miden la presión absoluta se llaman barómetros. En cambio para medir la presión relativa, se utiliza el manómetro.



Referencias:

Edision: Presión atmosférica, absoluta y relativa (master D - España)

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