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The distinction depends on what causesThinking about this some more, the answer is a result of physics: gases exert pressure difference, i(due to molecules bumping into each other).e This is what causes a gas to expand to occupy all available volume. where the power sourceThe only force at work is that movesa repellent one, so the airanswer must be "blown out". A

In everyday language, there are some exceptions. We say a vacuum cleaner sucks. Physically, anit pumps air compressor blows. In this casefrom the vacuum chamber to the outside, lowering the space ship maintains a higher pressure thanin the ambient using compressed gas cylindersvacuum chamber and pumps, so blow out would be correctenabling air to rush in through the nozzle.

The distinction depends on what causes the pressure difference, i.e. where the power source is that moves the air. A vacuum cleaner sucks, an air compressor blows. In this case, the space ship maintains a higher pressure than the ambient using compressed gas cylinders and pumps, so blow out would be correct.

Edit:

Thinking about this some more, the answer is a result of physics: gases exert pressure (due to molecules bumping into each other). This is what causes a gas to expand to occupy all available volume. The only force at work is a repellent one, so the answer must be "blown out".

In everyday language, there are some exceptions. We say a vacuum cleaner sucks. Physically, it pumps air from the vacuum chamber to the outside, lowering the pressure in the vacuum chamber and enabling air to rush in through the nozzle.

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The distinction depends on what causes the pressure difference, i.e. where the power source is that moves the air. A vacuum cleaner sucks, an air compressor blows. In this case, the space ship maintains a higher pressure than the ambient using compressed gas cylinders and pumps, so blow out would be correct.