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empirical, meaning it can be observed or tested through direct experience or experiment.
Yes, water can have a measurable pH value. Pure water has a pH of 7, which is considered neutral. However, the pH of water can vary depending on factors such as impurities or dissolved substances.
yes because it takes up space
The observable change for burning a log is the production of heat, light, and smoke.
If anything above 7 is considered a base, then anything below 7 would be considered an acid. The pH scale ranges from 0 to 14, with 7 being neutral. Substances with a pH below 7 are acidic.
A pH level of 5.5 is slightly acidic. The neutral pH is 7, anything below 7 is considered acidic, and anything above 7 is considered alkaline.