# What are standard conditions?

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For example, in the equation #\Delta G^{\circ} = \Delta H^{\circ} - T\Delta S^{\circ}# ,

#\Delta G^{\circ}# seems to be temperature dependent, so does that mean #\Delta G^{\circ}# only applies at a specific pressure?

For example, in the equation

##### 1 Answer

Jan 4, 2018

See Below.

#### Explanation:

Examples of **standard conditions** are **Standard Temperature**, **Standard Pressure**, or **STP** (Standard Temperature and Pressure).

At **STP**,

Temperature =

273.15K,

Pressure =1 atm(before 1982)

Pressure =1 bar(after 1982)

Also, at **STP**,

1 mol of IDEAL gas = 22.414 Lat 1 atm

1 mol of IDEAL gas = 22.711 Lat 1 bar

This is not to be confused with **thermodynamic standard conditions**, which is what you are looking for. It is similar, but

Temperature =

298.15K,

Pressure =1 atm(before 1982)

Pressure =1 bar(after 1982)