The International System of Units (SI) defines standard units and symbols for various physical quantities. These symbols are universally recognized and used in science, technology, and trade.

SI Symbol for Thermodynamic Temperature

Thermodynamic temperature is one of the seven base quantities in the SI system. Each base quantity has a specific base unit and a corresponding symbol.

The base unit for thermodynamic temperature is the kelvin, and its symbol is officially designated by the SI system.

• The unit kelvin is defined based on the Boltzmann constant and the triple point of water.
• The symbol for the kelvin is an uppercase letter, 'K'.
• This symbol is used to denote a temperature value on the Kelvin scale (e.g., 300 K).

Let's look at the other options to understand why they are not the symbol for thermodynamic temperature:

• m: This is the SI symbol for the metre, which is the base unit for length.
• s: This is the SI symbol for the second, which is the base unit for time.
• A: This is the SI symbol for the ampere, which is the base unit for electric current.

Therefore, the only symbol representing thermodynamic temperature among the given options is K.