Word: trillionth
(lookup in dictionary)
(lookup stats)
Dates: during 1930-1939
Sort By: most recent first
(reverse)
...switch by a time interval which must be measured in billionths of a second. Because that infinitesimal measurement is possible and because the time lag is different for every element and every form of every element, it is a delicate analyzer of unknown substances. It can discern one trillionth of a part of a foreign substance in anything presented to its wrenching beam. Last week's triumph of Professor Allison was his ability to state that eka-cesium had six very similar forms or isotopes. No. 87 belongs to the base-forming family of elements which include lithium, sodium, potassium...