Why do you want to the vacuum flask into oval?
Should the most number of round ball. On the other hand, round the spherical container was inconvenient to use. Therefore, people make the vast majority of container into cylindrical, this is really the best of both worlds.
Hello, if it is a party, angular, first take inconvenient, the second, children met there will be a surprise The hope can help you. (* ^ __ ^ *) hee hee..
In daily life people use hot water bottle, teapot, teacup, such as containers, is cylindrical. Why not square? "If cup made of, not only when water is not convenient, also easy to touch bad ah!" Someone will think so. In fact, this is not the main reason. People made anything, always want to consider two aspects:
A saving material, easy to use. Practice shows that, with the same amount of material into a cylindrical container, than make it more square column shaped containers. So, like many things such as the granary, cans, tank containers, mostly in the form of cylindrical. If only consider saving materials, so using the same material container, does not count cylindrical filled up;
