welding atmosphere
41Package testing — Military shipping container being drop tested Testing …
42Safe — A safe (also called strongbox, coffer or kist) is a secure lockable box used for securing valuable objects against theft or damage. A safe is usually a hollow cuboid or cylinder, with one face removable or hinged to form a door. The body and door …
43materials science — the study of the characteristics and uses of various materials, as glass, plastics, and metals. [1960 65] * * * Study of the properties of solid materials and how those properties are determined by the material s composition and structure, both… …
44Shielding gas — Shielding gases are inert or semi inert gases that are commonly used in several welding processes, most notably gas metal arc welding and gas tungsten arc welding. Their purpose is to protect the weld area from atmospheric gases, such as oxygen,… …
45Électron — Traduction à relire Electron → …
46Mathematics and Physical Sciences — ▪ 2003 Introduction Mathematics Mathematics in 2002 was marked by two discoveries in number theory. The first may have practical implications; the second satisfied a 150 year old curiosity. Computer scientist Manindra Agrawal of the… …
47ship construction — Introduction complex of activities concerned with the design and fabrication of all marine vehicles (ship). Ship construction today is a complicated compound of art and science. In the great days of sail, vessels were designed and… …
48Sunburn — A sunburn is a burn to living tissue such as skin produced by overexposure to ultraviolet (UV) radiation, commonly from the sun s rays. Exposure of the skin to lesser amounts of UV will often produce a suntan. Usual mild symptoms in humans and… …
49Space manufacturing — is the production of manufactured goods in an environment outside a planetary atmosphere. Typically this includes conditions of microgravity and hard vacuum.Manufacturing in space has several potential advantages over Earth based industry.# The… …
50Vacuum packing — Salt baked chicken feet sold in China: vacuum packed and ready to eat Vacuum packing or vacuum packaging is a method of packaging that removes air from the package prior to sealing. It can involve both rigid and flexible types of packaging. The… …
