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SI Units: 2019 Redefinition01:13

SI Units: 2019 Redefinition

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Measurement is an indispensable part of analytical chemistry. The result of measurement helps quantify a substance's physical property and compare it with the physical property of another substance. Each measurement comprises two components - a number indicating the magnitude and a unit of measurement as a standard for comparison. Further, the same quantity can be measured using different units of measurement, which leads to differences in magnitude.
A standard set of units has been defined...
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Units and Standards of Measurement01:10

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A physical quantity is defined either by specifying its measurement method or by stating how it is calculated from other measurements. For example, consider a metallic cube. We might define its mass and dimensions by specifying methods for measuring them, such as using a weighing machine and a meter scale. Then, we could define the volume by stating that it is the cube of its side, and we could calculate the density as the mass divided by the volume.
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Units of Measurement01:27

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Mechanical engineering is one of the oldest branches of engineering. It deals with designing, analyzing, and manufacturing machines and mechanical systems. To ensure precise and accurate calculations, units of measurement are used. They provide a standard system for expressing and comparing physical quantities.
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Every measurement provides three kinds of information: the size or magnitude of the measurement (a number), a standard of comparison for the measurement (a unit), and an indication of the uncertainty of the measurement. While the number and unit are explicitly represented when a quantity is written, the uncertainty is an aspect of the errors in the measurement results.
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The International System of Units, known as the SI system, is a universally accepted measurement system recognized and used worldwide. The SI system is based on a set of three base units considered absolute, and their values do not change with location. These base units are meters, kilograms, and seconds.
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In any system of units, the units for some physical quantities must be specified through a measurement process. These measurements are the base quantities of the system, and their units are the base units of the system. The algebraic combinations of the base values can then be used to express all other physical quantities. Each of these physical quantities is then referred to as a derived quantity, with each unit being referred to as a derived unit.
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Related Experiment Video

Updated: Mar 2, 2026

Application of Design Aspects in Uniaxial Loading Machine Development
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The Standard Joint Unit.

Cristina Casajuana Kögel1, María Mercedes Balcells-Olivero2, Hugo López-Pelayo2

  • 1Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; Grup de Recerca en Adiccions Clínic (GRAC), Addictions Unit, Department of Psychiatry, Clinical Institute of Neuroscience, Hospital Clínic, Universitat de Barcelona, Red de Trastornos Adictivos (RTA), Spain.

Drug and Alcohol Dependence
|May 23, 2017
PubMed
Summary
This summary is machine-generated.

A new Standard Joint Unit (SJU) of 7mg of 9-Tetrahydrocannabinol (9-THC) was established to standardize cannabis consumption measurement. This unit aids clinical and epidemiological assessments of marijuana and hashish use.

Keywords:
9-TetrahydrocannabinolCannabisMetricsPreventionStandard unit

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Area of Science:

  • Cannabis research
  • Pharmacology
  • Public health

Background:

  • Accurate quantification of cannabis consumption is crucial for epidemiological and clinical assessments.
  • Existing methods lack standardization, leading to variability in data.
  • A need exists for a consistent unit to measure cannabis intake.

Purpose of the Study:

  • To establish a Standard Joint Unit (SJU) based on 9-Tetrahydrocannabinol (9-THC) content.
  • To provide a reliable measure for assessing cannabis consumption.
  • To facilitate epidemiological and clinical analysis of cannabis use.

Main Methods:

  • A naturalistic study involving 492 participants in Barcelona (February 2015-June 2016).
  • Participants, who used cannabis in the last 60 days, completed questionnaires and donated joints for analysis.
  • Analysis focused on determining 9-Tetrahydrocannabinol (9-THC) and Cannabidiol (CBD) content in donated marijuana and hashish joints.

Main Results:

  • 315 valid joints were analyzed, with participants averaging 29 years old, predominantly male (77%) and employed (63%).
  • Median 9-THC content was 6.56mg for marijuana and 7.94mg for hashish.
  • Median Cannabidiol (CBD) content was negligible in marijuana but significant in hashish.

Conclusions:

  • A Standard Joint Unit (SJU) was defined as 7mg of 9-THC, equivalent to one joint or 0.25g of cannabis.
  • The SJU standardizes measurement across marijuana and hashish, similar to the Standard Drink Unit for alcohol.
  • The SJU is valuable for clinical, epidemiological, and research applications in cannabis studies.