Columbia Encyclopedia

Search results

500 results found

helium

(Encyclopedia)helium hēˈlēəm [key], gaseous chemical element; symbol He; at. no. 2; at. wt. 4.0026; m.p. below −272℃ at 26 atmospheres pressure; b.p. −268.934℃ at 1 atmosphere pressure; density 0.1785 g...

Np

(Encyclopedia)Np, symbol for element neptunium. ...

McMillan, Edwin Mattison

(Encyclopedia)McMillan, Edwin Mattison, 1907–91, American physicist, b. Redondo Beach, Calif., grad. California Institute of Technology, 1928, Ph.D. Princeton, 1932. On the faculty of the Univ. of California from...

absorption

(Encyclopedia)absorption [Lat.,=sucking from], taking of molecules of one substance directly into another substance. It is contrasted with adsorption, in which the molecules adhere only to the surface of the second...

Mg

(Encyclopedia)Mg, symbol for the element magnesium. ...

At

(Encyclopedia)At, symbol for the element astatine. ...

Mn

(Encyclopedia)Mn, symbol for the element manganese. ...

Mo

(Encyclopedia)Mo, symbol for the element molybdenum. ...

Li

(Encyclopedia)Li, symbol for the element lithium. ...

As

(Encyclopedia)As, symbol for the element arsenic. ...