heat capacity – the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius Heat of vaporization – the amount of energy needed to change one gram of a liquid substance to a gas at constant temperature Zwitterion – a molecule composed of individual functional groups which are ions, of which the most prominent examples are the amino acids Chemical polarity – a neutral, or uncharged molecule or its chemical groups having an electric dipole moment, with a negatively charged end and a positively charged end References External links The Bubble Wall (audio slideshow from the National High Magnetic Field Laboratory explaining cohesion, surface tension and hydrogen bonds) "Adhesion and Cohesion of Water" – US Geological Survey Molecular physics Intermolecular forces Physical quantities