1 By comparison, machine shops also cut metal, but they are more concerned with the machining of parts on machine tools. 2  Firms that encompass both fab work and machining are also common. 3  Blacksmithing has always involved fabrication, although it was not always called by that name.
When water is in its solid state (ice) , the water molecules are packed close together preventing it from changing shape. Ice has a very regular pattern with the molecules rigidly apart from one another connected by the hydrogen bonds that form a crystalline lattice.
The volume of water changes when the water changes state from a liquid to a solid because of the formation of hydrogen bonds within it. The bonds, which are weak, are always p â¦ resent to some degree in the liquid, but as water goes solid, the formation of hydrogen bonds sets up a molecular arrangement in the water. The bonds force the water molecules into a solid structure and they push the molecules apart to do that. The extra space the water molecules then take up makes the ice less dense than the water from which it formed. That is why ice is less dense than water, and why it floats on water as we see it does. Why does the volume of water change when it freezes? That is because the gas particle's are traped in the ice