acidity or alkalinity
pH is a measure of the hydrogen ion (H+) activity in a solution.
We can use a pH paper.
Other pH indicators like bromothymol blue, methyl red, or universal indicator can be used as alternatives to phenolphthalein for measuring pH. Additionally, pH meters can provide a more accurate and continuous measurement of pH compared to indicators.
pH is a measure of acidity...
The pH of solutions (liquids) is measured.
pH paper and pH meter
You can measure the pH of an unknown liquid using a pH meter or pH test strips. Simply dip the pH meter or test strip into the liquid and observe the reading or color change, respectively. This will give you an indication of the pH level of the unknown liquid.
These electrodes measure the pH value.
measure the pH of a liquid and possibly a solid
pH is a measure of acidity or alkalinity of a solution.
The pH is a measure of the acidity/basicity of a solution.
You can't convert that - they measure completely different things. pH is a measure of acidity. Bar is a measure of pressure.