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Episode 3: Mass Hysteria! The nefarious Major Uncertainty has kidnapped Monsieur Kilogram, putting the world’s measurements of mass in jeopardy.After rescuing Monsieur Kilogram and capturing Major Uncertainty, our Superheroes take a break and play a game of "Two Truths & a Lie."

Comic book-style video animations, available on the NIST YouTube Channel. Contact the NIST Metric Program at TheSI and include your name and U.S. Hardcopy charts are available while supplies last. Additionally, mention the combination of SI base units creates the SI derived units. State each base unit depends upon a defining constant. Teaching TipsĮxplain the SI base units, unit definitions, and metric prefixes. Use caution when handling paper edges to prevent injury. Recognize the definitions of base units.The chart may be printed on any paper size but is recommended to be at minimum 215.9 mm x 279.4 mm (8.5 in x 11 in). NOTE: Four new International System of Units (SI) prefixes (ronna, ronto, quetta, and quecto) were adopted in November 2022 and are not currently represented in this publication. The chart provides an entertaining way to learn more about the International System of Units (SI). SI Prefix symbols featured in the chart are used to represent smaller or larger units by factors that are powers of 10. The superheroes include the following: Mole, Professor Second, Monsieur Kilogram, Ms. This resource provides a colorful printable SI system chart, which displays the 7 SI base unit, prefix symbols, and features the Measurement League: Guardians of the SI superheroes, dedicated to the fight against uncertainty, imprecision, and inaccuracy and to improving the quality of our lives and the things we build. National Type Evaluation Program (NTEP).National Conference on Weights and Measures (NCWM).External Resources for Weights and Measures Expand or Collapse.Fuels and Lubricants Subcommittee (FALS).National Legal Metrology Expand or Collapse.Laboratory Metrology Expand or Collapse.

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To change from m/s to km/h multiply by 3.6 To change from km/h to m/s divide by 3.6Ģ0 m/s = 20 x 3.6 = 72 km/h. Conversely, we divide by 3600 to change from seconds to hours. To change from hours to seconds we multiply by 3600 since there are (60 x 60) seconds in 1 hour. When you observe these two calculations, you can identify that the conversion factor used from the pair depends on the unit required to be converted. Based on this relationship we can create pair of conversion factors \ From prefixes we know \īoth \(1000mg\) and \(1g\) refer to the same amount, but in different units. For instance, conversion of miligrams to grams. We can use conversion factors to convert one unit to another. The multiples and fractions of SI units are expressed with prefixes.Ĭommon SI and matrix unit prefixes Prefix Therefore, prefixes have been introduced to express such measurements. For instance, expressing the diameter of a bacterial cell \(\left(0.0000001m\right)\) in metres is challenging. This system is known as the international system of units (SI Units).Ī common issue associated with any measuring system is that depending on the quantity, the unit we use might be inconvenient to express. Therefore, scientists have introduced standard units for each physical quantity to avoid confusion. For instance, weight can be expressed in kilograms, grams, pounds etc. Therefore, adding a unit next to a quantity is essential to get the correct information.Ī physical quantity can be measured in several units. If you say just three without kilograms, it won’t make sense to your friend as three can be in any units we use to measure mass, such as grams, miligrams, kilograms, pounds etc. For instance, you say to a friend that you have gained \(3kg\) during the past three months. If you expressed a quantity without a unit, it would not provide much information.