Quote:
Originally posted by Rickref
If the air is still there the mass stays the same. If the volume decreased: Denisty = mass/volume the Denisty of the ball has increased. I'd be more inclined to say as temperature decreases the air molecules move more slowly, hitting the sides of the ball less often, creating less pressure. But hey, I'm just an 8th grade science teacher.
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I'm glad I'm not the only dork who caught this.
And when your students get to the 11th grade (?) they'll find out that PV = nRT, which is another way of saying as the air cools (T) or as you let out some air (n) the pressure (P) reduces while the volume (V) remains constant, which it does in this case because the ball is not getting smaller or larger.
Just softer. Like our heads.
