Answer :
The relationship between degrees Kelvin and degrees Celsius is:
K = C + 273.15
So, -38.87 + 273.15 = 234.28
So, the substance is not mercury because the melting points in Kelvin are unequal.
K = C + 273.15
So, -38.87 + 273.15 = 234.28
So, the substance is not mercury because the melting points in Kelvin are unequal.