Units of measurement the second is the base unit of time and other units like minutes hours etc are derived from it the measurement of time requires the specification of units but there are many different units of time some of which may be more appropriate in certain circumstances than others. A unit of time or time unit is any particular time interval used as a standard way of measuring or expressing duration the base unit of time in the international system of units si and by extension most of the western world is the second defined as about 9 billion oscillations of the caesium atom. Originally sandglasses were used as a measure for periods of time like the lamps or candles but as clocks became more accurate they were used to calibrate sandglasses to measure specific periods of time and to determine the duration of sermons university lectures and even periods of torture. The measure of time i so long as we do not go outside the domain of consciousness the notion of time is relatively clear not only do we distinguish without difficulty present sensation from the remembrance of past sensations or the anticipation of future sensations but we know perfectly well what we mean when we say that of two
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