If cool air is more dense and sinks, what effect do you think that would have on air pressure on the ground? If warm air is less dense and rises, what effect do you think that has on air pressure on the ground?
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Greater activity of the heated molecules increases the spacing between neighboring molecules and thus reduces air density. The decreasing air density then lowers the pressure exerted by the air. Warm air is thus lighter (less dense) than cold air and consequently exerts less pressure.

Explanation:

- "schenck v. united states, case in which the u.s. supreme court ruled on march 3, 1919, that the freedom of speech protection afforded in the u.s. constitution's first amendment could be restricted if the words spoken or printed represented to society a “clear and present danger.” "

- speech aimed to potentially create danger could be banned.

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first paragraph (and busy all the night ,with a silence deep and white )