Physics:Salt equivalent

Salt equivalent is usually quoted on food nutrition information tables on food labels, and is a different way of defining sodium intake, noting that salt is chemically sodium chloride. To convert from sodium to the approximate salt equivalent, multiply sodium content by 2.5:

[math]\displaystyle{ \frac{m_\mathrm{NaCl}}{m_\mathrm{Na}} = \frac{m_\mathrm{Na}+m_\mathrm{Cl}}{m_\mathrm{Na}} \approx \frac{23\mathrm{u} + 35.5\mathrm{u}}{23\mathrm{u}} = \frac{58.5}{23} \approx 2.5 }[/math]

(see: atomic mass and molecular mass).

Sources

• British Nutrition Foundation article on salt

Further reading

• Food and Health Manifesto, London: Food and Drink Federation, 2005, https://www.fdf.org.uk/showdoc/opendoc2.aspx?id=587, retrieved 2007-10-12