The 10 leading causes of death in the world, 2000 and 2012. Ischaemic heart disease, stroke, lower respiratory infections and chronic obstructive lung disease have remained the top major killers during the past decade. HIV deaths decreased slightly from 1.7 million (3.2%) deaths in 2000 to 1.5 million (2.7%) deaths in 2012. Diarrhoea is no longer among the 5 leading causes of death, but is still among the top 10, killing 1.5 million people in 2012. Chronic diseases cause increasing numbers of deaths worldwide.
pH. The pH of a solution is a measure of the molar concentration of hydrogen ions in the solution and as such is a measure of the acidity or basicity of the solution.The letters pH stand for power of hydrogen and the numerical value is defined as the negative base 10 logarithm of the molar concentration of hydrogen ions.xamples of pH Values. The pH of a solution is a measure of the molar concentration of hydrogen ions in the solution and as such is a measure of the acidity or basicity of the solution.
The lower the pH, the higher the concentration of H+ ions and the more acidic the solution is. pH is basically a measure of how many H+ ions are in solution. We calculate pH through this formula: [math]pH=-log[H+] [/math] So you are basically taking the negative log of the concentration of H+ molecules in solution. So, for example, if we have 10 mols of H+ ions per liter of solvent, our pH would be -1.