Defination of coldwelds

coldweld or coldwelding means to join two surfaces (metals) without heat by forcing the both surfaces.

Explanation:

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.