
Impurity
Physical Contaminants
Refers to tangible substances that can often be seen or felt.
The factory's runoff introduced impurities into the riverbed.
Measure and Act
Often used to indicate that action is needed to remove the impurities.
We need to measure the impurity levels before purifying the water.
Purity Contrast
Highlights the difference from a pure state; anything added that is unwanted.
Detecting impurities in this chemical solution is critical for the experiment.