The two reference temperatures used for most common scales are the melting point of ice and the boiling point of water.
(The two reference temperatures; used; for most common scales) (The two reference temperatures used for most common scales; are; the melting point of ice and the boiling point of water)
The two reference temperatures The two reference temperatures used for most common scales
used are
for most common scales
the melting point of ice and the boiling point of water