Map of driving directions from Spring, TX to Houston, TX. Click here to show map. Drag the line on the map to calculate the driving distance for a different route. If you want to verify these driving directions or look for another possible route, you can try. Google Maps, Bing Maps, or MapQuest.
The second (symbol: s) (abbreviated s or sec) is the base unit of time in the International System of Units (SI).
A second is defined as the time interval required for 9 192 631 770 transitions between two energy states of the cesium atom to take place. The atomic definition of the second, together with current technology, allows it to be measured with much smaller uncertainties than any other SI unit.