Medical term:

molality


molality

 [mo-lal´ĭ-te]
the number of moles of a solute per kilogram of solvent. See also molarity.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

mo·lal·i·ty (m),

(mō-lal'i-tē),
Moles of solute per kilogram of solvent; the molarity is equal to mρ/(ltmM), where m is the molality, ρ is the density of the solution, and M is the molar mass of the solute. Compare: molarity.
Farlex Partner Medical Dictionary © Farlex 2012

molality

A fraction of a solution expressed in moles of solute/kg of solvent.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

mo·lal·i·ty

(mō-lal'i-tē)
Moles of solute per kilogram of solvent; the molarity is equal to mρ/(1 + mM), where m is the molality, ρ is the density of the solution, and M is the molar mass of the solute.
Compare: molarity
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

molality

Number of moles (see MOLE 2.) of solute in 1000 g of solvent.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

molality

the number of MOLES of a solute present in a kilogram of pure solvent.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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