Summer weather really starts in July and ends in September. Summer temperatures average around 80 degrees but do go over a 100 for one or two days a year. Overnight temperatures average around 60 degrees. This is a 90 day period that typically has very little (and sometimes none) rain. The summer is really one of the best parts about Portland.
Some do. Electrolytes, which are substances that break into ions when dissolved in water, will conduct electricity. Such substances include soluble salts, acids, and bases. Otâ¦her water soluble substances are non electrolytes and do not break into ions in water, or at least do so in extremely minute amounts.
When ionic substances are dissolved in water they do not exist as the pure substance (i.e. NaCl) but as dissociated ions (i.e. Na+ and Cl-). These ions respectively carry a positive and negative charge. Water (H2O) is a polar molecule meaning that it has a positive (on the hydrogen atoms) and negative (on the oxygen atom) dipole moment. When NaCl is dissolved in water, the Na+ ions attract the negative dipole moment of H2O and the Cl- ions attract the positive dipole moment of H2O.