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Diphenyl ((C6H5)2) is a white crystalline solid insoluble in water. It is obtained from benzene or toluene and is extremely toxic. Its main usage is as one of the components of heat-transfer fluids capable of operating at temperatures around 700 K.

Below are some of its physical characteristics:

Molecular weight: 154.21Critical temperature: 789 K
Melting point:342.4 KCritical pressure: 3.85 MPa
Normal boiling point: 528.4 KCritical density: 323 kg/m3
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