What are planetary side effects of having a thicker atmosphere?

I've been told that having a thicker atmosphere would make it easier to fly, particularly of heavier-than-air designs, so I'm interested in giving my planet such conditions. I'm mainly interested things like temperature, weather, seasons, the distribution of land versus water - basically, how the planet itself would be affected simply by having a thicker atmosphere. I'd still like for this planet to be Earth-like, capable of housing multiple intelligent humanoid species.

I'm admittedly not very knowledgeable about the subject, but I'd presume a few things - feel free to correct me if I'm wrong:

• Wind: Winds would be more forceful... I think? This one I'm less sure of!
• The planet would be hotter on average, since less gas would escape the atmosphere
• Objects could be treated as lighter than they are - people jumping higher, objects thrown farther, heavier things more capable of flight

Are these assumptions wrong? And what other possibilities/realities are likely from such a scenario?

posted over 4 years ago

Vigilant‭

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