Midpoint of two measurements

Find the value exactly halfway between two measurements expressed in the same unit.

Midpoint:

Difference:

Example

Example: between 18.5 °C and 21 °C, the midpoint is 19.75 °C and the difference is 2.5 °C.

This is the arithmetic mean of two values. It is useful for finding a central value, but it does not replace an average calculated from a larger dataset.

(A + B) / 2

The periodic table, built for exploration

118 elements. One clear map of matter. Explore the periodic table, open any element, or jump straight into scientific converters.

Dmitri Mendeleev arranged the known elements so that recurring chemical properties became visible. He deliberately left gaps where the pattern suggested undiscovered elements should exist. That idea — structure before completeness — still makes the periodic table one of science’s most powerful maps.

Phenomena

Everyday scientific phenomena explained with living diagrams and concise, carefully checked text. The motion helps show the mechanism; the article explains what the diagram simplifies.

Evaporation is the passage of molecules from the surface of a liquid into the gas phase. Water does not need to boil for this to happen.