What is a Primary Atmosphere regarding a planet?

Answer 1

A primary atmosphere is the initial atmosphere a planet has shortly after it formed.

Earth has had a number of different atmospheres that have changed over time. Earth's first or primary atmosphere was probably made of of the same gases that were accumulating in the prorto-sun - hydrogen and helium, Perhaps also methane and ammonium.

After the Earth was hit by a stray proto-planet (which after collision with Earth became the moon), the initial atmosphere was probably blown away towards the larger Jovian planets. Energy bursts from the sun may have also stripped away Earth's primary atmosphere.

Over time the atmospheric composition changed a number of times and most recently (past 2 billion years) life itself added oxygen to the atmosphere.

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Answer 2

Christopher Ales

A primary atmosphere refers to the original atmosphere that a planet accretes from the surrounding solar nebula during its formation. This atmosphere is composed of gases and other volatile elements present in the protoplanetary disk.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.