we need to measure time for a variety of applications like to meet our clear cut schedules,to know the rate of heart bet per minute,to know when a plate or train arrived or left,for writing exams ,the duration of a journey,if we want to wait for someone or watch something ,to sleep,to wake up in time ,to know wheather its night or day,to know what time a computer takes to perform an operation etc.................so the list is endless
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Mass divided by time, where the mass is measured in tons and the time is measured in hours. If the mass and time are measured in other units they will need to be converted to tons and hours.
in earlier times time was measured by sandclock or waterclock
No - because time is measured in seconds, not linear distance.
It depends on the circumstances. Time needs to be measured in different units depending on how it's applied. For example:- Computer processing speed is measured in milliseconds Ordinary time is measured in seconds, minutes, hours, days, weeks, months and years. Large periods of time are measured in centuries and millennia.
by the movement of the sun