but checking the pressure of a tire is a MEASUREMENT not an observation, LOOKING a tire and seeing it is soft is an observation...
Now, this is an interesting parallel to the question... When you take the pressure of a tire, air escapes, so the pressure you get is different from the pressure that was in it before you measured it.
75 posted on 01/22/2014 7:46:25 PM PST by zeugma
(Is it evil of me to teach my bird to say "here kitty, kitty"?)