Is the glass half empty or half full? shown that a speaker's choice of frame can reflect their knowledge of the environment, and that listeners can be sensitive to this information. Is the glass half empty or half full? "Is the glass half empty or half full?" is a common expression, a proverbial phrase, generally used rhetorically to indicate that a particular situation could be a cause for optimism (half full) or pessimism (half empty), or as a general litmus test to simply determine an individual's worldview. The purpose of the question is to demonstrate that the situation may be seen in different ways depending on one's point
Alkalinity alkalinity of a typical seawater sample. Contributions are in μmolkg−soln and are obtained from "A Handbook of Methods for the analysis of carbon dioxide parameters in seawater "","(Salinity = 35 g/kg, pH = 8.1, Temperature = 25 °C). Phosphates and silicate, being nutrients, are typically negligible. At pH = 8.1 [HSO] and [HF] are also negligible. So, Addition (or removal) of CO to a solution does not change its alkalinity, since the net reaction produces the same number of equivalents of positively contributing species (H) as negative contributing species (HCO and/or CO). Adding CO to the solution lowers its pH,