![]() A square shape (area) has two dimensions (e.g., length and width), while a cube (volume) has three dimensions (e.g., length, width, and height). Some measurements have one dimension, for example length. For example, changing the magnitude of a SI quantity or converting between SI and non-SI units. After students become proficient using the metric system and are comfortable applying SI measurements, they may encounter applications that require mathematical conversions between SI and non-SI units.ĭimensional analysis is a technique used to convert measurements. Teach the metric system without making any comparisons to non-SI measurements. Teach non-SI unit conversions only when required. ![]() Metric System Education - Learning the SI is not about making mental unit conversions (this will slow you down).Best Practices - Resources are available for organizations systematically adopting the International System of Units (SI) within business systems and those analyzing the risks of working in hybrid or dual measurement environments.Errors and Mishaps may result when multiple measurement systems are simultaneously used.Pressure and Gas Flow Conversion Information.NIST HB 133 Appendix E (Current Edition)provides unit conversion factor tables for the benefit of those requiring an reference when checking the net contents of packaged goods.customary units, including notes on British measurement units. NIST HB 44 – Appendix C (Current Edition) provides several convenient conversion factor tables for length, area, volume (dry and liquid measure), and mass using SI (metric system) and U.S.NIST SP 1038 (Current Edition) lists the units of the International System of Units (SI), or metric system, recommended for use in trade and commerce and other general uses.NIST SP 811 – Appendix B (Current Edition) provides guidance on the use of conversion factors which are expressed using scientific notation (listed both alphabetically and by topic areas) and rules for rounding numbers and converted numerical values of quantities.Common conversion factors are also listed (Section 5). This multi-step process is presented in NIST SP 1038 - 2006 (Section 4.4), including a rounding procedure for technical documents, specifications, and other applications such packaged goods in the commercial marketplace and temperature. Unit conversion is a multi-step process that involves multiplication or division by a numerical factor, selection of the correct number of significant digits, and rounding. 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.International Legal Metrology Expand or Collapse.OWM Products and Services Expand or Collapse.Refer to the Common Unit Systems page for further information. The intent of this site is to provide a convenient means to convert between the various units of measurement within different systems, as well as to provide a basic understanding of the systems currently in use, and how they interact. Although SI is intended for global use, it has not been fully adopted, and some other systems of measurement are still used in parts of the world. Currently, the global standard of measurement is the International System of Units (SI), which is a modern form of the metric system. In human history, various unit systems were developed and used in different regions and cultures. Other quantities can be expressed as a multiple of the unit. Unit Converters - Full Versions Common ConvertersĪ unit is a measurement of a quantity that is defined or adopted by tradition or law.
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