Chemical Change A change that produces one or more new substances and may release energy. Chemical Property A second set of properties in all kinds of matter. Circuit A path that is made from an electrical current. Claws A sharp, usually slender, and curved nail on the toe of an animal.
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.
It's a unit of measurement used to categorize a length of time. Also called timeframe. Use time period in a sentence. I did not know the time period of when the package would ship and when it would arrive at my house and it made me agitated. 22 people found this helpful. You need to know how to accurately predict how your product will sell during a time period so you have enough on hand.