# first.items[].content
Atom, size comparison;

Say, diameter of electron is 1mm (0.1 cm)

Then, diameter of,
proton 1m (1000x electron)
nucleus 10m (10x proton)
electron orbit 100km (10000x nucleus)

# first.items[].contentMap.en
Atom, size comparison;

Say, diameter of electron is 1mm (0.1 cm)

Then, diameter of,
proton 1m (1000x electron)
nucleus 10m (10x proton)
electron orbit 100km (10000x nucleus)