[amlanbiswas]

When I create a heat capacity expression for water and try to plot, it shows me this error.

WARNING
Syntax error detected in the expression assigned to 'Meat Water'.
Successfully read 70 characters:
4128.9[J/(kg K)]-0.090864*(T-273.15[K] )[J/(kg K)]+0.0054731*(T-273.15
then error detected at:
[k])^2[J/(kg K^-3)]
Details - Unrecognised or invalid units.

I am struggling to understand the problem.

the expression is
4128.9[J/(kg K)]-0.090864*(T-273.15[K] )[J/(kg K)]+0.0054731*(T-273.15[k])^2[J/(kg K^-3)]

[ghorrocks]

The error message tells you exactly what the problem is: [k] is invalid units. Try making it [K]. The "K" of Kelvin is case sensitive.