...that is also why ice floats. it displaces water, like a boat, not floats on top, like a feather.
LOL !
Your conflation causes confusion.
ALL matter "displaces" other matter in which it does not simply dissolve, regardless of whether or not it is floating. The rock in the bottom of the pond is displacing a volume of water equal to its own.
Solid H2O (ice)
is less dense than an equal mass of liquid H2O due to the way the molecules (must) organize in forming the solid crystaline structure. This is why ice under water floats to the surface when not inhibited by another force, the same reason a balloon full of helium or merely "hot air" rises as it does. This has nothing to do with displacement which is simply a measure of volume, not mass.
A feather placed
under water does NOT float to the surface unless sufficient low-density material is trapped within (air, oil, etc.) because the materials of which a feather is composed (like a metal boat) is more dense than water. The feather and boat both float on the surface for the same reason - i.e. the
manner in which they displace the water. The molecules of water directly in the path of the force-vector (gravity) of the object being set upon them resist compaction (due to atomic forces) and thus are being forced out of the path of the object instead - HOWEVER there are
other objects in the way of their progress, namely other molecules of water or what not trying to keep them in place (or rather out of their particular space). Thus, resistance to displacement involves the combined forces of numerous molecules resisting compression and also inertia (i.e. they refuse to compress and don't want to move either), and for lighter objects their is the cohesive forces involved in "surface tension" as well. Well, once sufficient force is applied to overcome these resistance forces, the water
does move (i.e. it is displaced), and in an open-top container the direction of movement is up, a direction resisted by what we call "gravity" (which is also trying to compress & displace the water). Now the end result of this is that an object of materials of greater density can be made to "float" if structured so as to spread its weight (note, not it's mass) over sufficient area (surface molecules) of the less-dense material being displaced such that the force vectors par-out.
WOW, that was convoluted. In summary, ice is less dense than water of equal mass, and displacement is the alternative to compression when sufficient force is applied to accomplish the former. Compression of steel
can occur but only where a less dense contaminant exists in the steel, i.e. an "inclusion" of gas.
It is difficult to believe that someone brought up the idea of "compressing" steel in a serious manner...? I thought it was a joke.
And none of this has to do with fullers or "blood grooves".
They do make it nice for a pinch grip on a larger blade when you want to use the tip or end of the belly for precise cuts - sometimes the object is heavy enough to make it awkward to hold the knife steady and use the object itself to make the slice.
This is a neat observation, something I have noticed myself - a groove aids in pinch-grip of the blade. Thank you for pointing that out. :thumbup:
:thumbup:
