At constant temperature and pressure the gibbs free energy value is a measure of the spontaneity of a process.
At constant temperature and pressure the gibbs free energy value is zero and when gibbs free energy value is zero then the process is spontaneous . The meaning of spontaneous is that the process is takes place smothly with any effect and itself .
The Gibbs free energy also known as Gibbs function , Gibbs energy or free enthapy . It is a quantity that is used to measure maximum amount of work done in a thermodynamic system when temperature and pressure is keep constant.
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