Metric System and SI Units
We often measure distances in miles and weight in pounds, which are English units, but since not everyone uses them, it can cause serious problems.
That’s why scientists and engineers use the International System of Units, or SI Units—a universal system ensuring accuracy and consistency worldwide.
There are seven basic SI units. For example, the meter, which measures length, can determine the length of a classroom.
Similarly, mass is measured in kilograms, time in seconds, current in amperes, temperature in kelvins, the amount of a substance in a mole, and luminous intensity in candelas.
SI units are easy to use because they are based on powers of ten, meaning each step is either 10 times larger or 10 times smaller than the next. Prefixes are added to represent smaller or larger quantities. For example, a centimeter is one-hundredth of a meter.
These units can also be converted into English units. For example, 1 meter equals 39.37 inches.
Using consistent units is crucial—once, in 1999, NASA lost a Mars satellite simply because the engineers and the software used different units.
Metric System and SI Units
The metric system and the International System of Units (SI) are the globally recognized standards for scientific measuremen…
We often measure distances in miles and weight in pounds, which are English units, but since not everyone uses them, it can cause serious problems.
That’s why scientists and engineers use the International System of Units, or SI Units—a universal system ensuring accuracy and consistency worldwide.
There are seven basic SI units. For example, the meter, which measures length, can determine the length of a classroom.
Similarly, mass is measured in kilograms, time in seconds, current in amperes, temperature in kelvins, the amount of a substance in a mole, and luminous intensity in candelas.
SI units are easy to use because they are based on powers of ten, meaning each step is either 10 times larger or 10 times smaller than the next. Prefixes are added to represent smaller or larger quantities. For example, a centimeter is one-hundredth of a meter.
These units can also be converted into English units. For example, 1 meter equals 39.37 inches.
Using consistent units is crucial—once, in 1999, NASA lost a Mars satellite simply because the engineers and the software used different units.
We often measure distances in miles and weight in pounds, which are English units, but since not everyone uses them, it can cause serious problems.
That’s why scientists and engineers use the International System of Units, or SI Units—a universal system ensuring accuracy and consistency worldwide.
There are seven basic SI units. For example, the meter, which measures length, can determine the length of a classroom.
Similarly, mass is measured in kilograms, time in seconds, current in amperes, temperature in kelvins, the amount of a substance in a mole, and luminous intensity in candelas.
SI units are easy to use because they are based on powers of ten, meaning each step is either 10 times larger or 10 times smaller than the next. Prefixes are added to represent smaller or larger quantities. For example, a centimeter is one-hundredth of a meter.
These units can also be converted into English units. For example, 1 meter equals 39.37 inches.
Using consistent units is crucial—once, in 1999, NASA lost a Mars satellite simply because the engineers and the software used different units.
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