Because a measurement is pointless without the unit. How would you feel if someone offered to pay you 25 per hour and then, after a day 's slog, they told you it was 25 cents an hour? If you had assumed 25 dollars that was your own fault!
Or you paid a 70 centilitres bottle of wine and you were given a 70 microlitres!
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Because measurements without units are totally meaningless. I can offer you 10 lots of cola for 50. I could mean 10 millilitres (a large sip) for £50 or 10 litres (10 large bottles) for 50 pence. One is a good deal the other is not. But if there are no units you will have no clue.
Measurements must be accompanied by appropriate units to ensure substances do not get mixed or used incorrectly. If they would get used incorrectly, accidents in the lab could occur.
You've gotta have units to know how much it is that you've got of whatever it is that you're measuring. Otherwise, how'd you know when you have one or more of whatever it is?
Units of measurement include meters for length, grams for mass, and liters for volume. Tools for measuring objects include rulers for length, scales for mass, and beakers for volume.
The units of measuring distance in the metric system include millimeters, centimeters, meters, and kilometers. These units increase in size by a factor of 10 as you move up the scale.
The 2 units for measuring current are: Ampere Milliampere
To convert measuring units, you need to know the conversion factor between the two units. Multiply the value in the original unit by the conversion factor to get the equivalent value in the new unit. Always remember to include the appropriate units in your final answer.
The metric units of weight include the gram (g), kilogram (kg), and metric tonne (t). These units are commonly used in most countries around the world for measuring weight.