-
Quantum entanglement
-
Amalgam
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Metamorphic rock
-
Gluten
-
Spar
-
Triclinic system
-
Arena
-
Eocene
-
Invariant
-
Mixotrophy
-
Bethe cycle
-
Kepler's laws
-
Cercus
-
Nectar
-
Trachyte
-
Prompt
-
COP
-
Elytra
-
Cytotoxic
-
Superconductivity
-
Disease
-
Jet engine
-
Activation
-
Electroconvulsive therapy
-
Opt-in
-
Respiratory system
-
Thymidine
-
Soot
-
New Moon
-
Gene therapy
pH
Hydrogen potential. pH is an index measuring the hydrogen ion activity in a solution. It is an indicator of the acidity (pH lower than 7) or alkalinity (pH higher than 7) of a solution.
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