STRONTIUM n.
ic element of the calcium group, always naturally occurring combined, as in the minerals strontianite, celestite, etc. It is isolated as a yellowish metal, somewhat malleable but harder than calcium. It is chiefly employed (as in the nitrate) to color pyrotechnic flames red. Symbol Sr. Atomic weight 87.3. A radioactive…
ABSOLUTE a.
rvature, which is measured in the osculating plane of the curve. -- Absolute equation (Astron.), the sum of the optic and eccentric equations. -- Absolute space (Physics), space considered without relation to material limits or objects. -- Absolute terms. (Alg.), such as are known, or which do not contain the unknow…