--------------------------------------------------------------------------------
http://online.cctt.org/physicslab/content/nexttime/questions/question_pg118.asp
Everybody knows that 'water seeks its own level' but very few people know why water seeks its own level. The reason has most to do with
a) atmospheric pressure,
b) water pressure depending on depth,
c) water's density.
--------------------------------------------------------------------------------
One of the purposes of education is to raise the thinking of the society to a higher level, and thereby benefit the society as a whole. So, in a sense, one purpose of an educator is to raise the level of the "water" rather than letting it sink to its own depth. And, why "water" sinks to its own level is explained in this URL. To lift up rather than to pull down is a noble endeavor.
So, one might be able to draw conclusions about one's place in the tank of learning based on one's swimming commentaries.
Education is a dynamic process rather than a static one. Thereby, it can offend the nature of "water".
.H.
--------------------------------------------------------------------------------
ANSWER:
Water pressure depends on depth, so only at equal depths of water will the pressure be equal. Consider the U-tube. If water is at rest where each x is, the pressures must be equal -- otherwise a flow would occur from the region of higher to the region of lower pressure until the pressures equalize. For this to happen, the depths below the surfaces must be equal.
This is true whatever the density of water or whether or not there is atmospheric pressure.
--------------------------------------------------------------------------------
--
The Design-L list for art and architecture, since 1992...
To subscribe, send mailto:design-l-subscribe-request@xxxxxxxxxxxxx.
To signoff, send mailto:design-l-unsubscribe-request@xxxxxxxxxxxxx.
Visit archives: http://lists.psu.edu/archives/design-l.html
