7. Planck Temperature

Planck temperature (Tₚ) is a unit of temperature in the system of Planck units. It serves as the defining unit of the Planck temperature scale. In this scale, when the magnitude of the Planck temperature value is one; it is equal to the Absolute Zero, that means Zero Kelvin. 

0 K = -273.15℃ = -459.67℉

It is the lowest limit of the thermodynamic temperature scale, a state at which nearly all the molecular motions ceased. Other temperatures can be converted to Planck temperature units, such as :

0℃ = 273.15 K = 1.9279×10⁻³⁰ Tₚ

The Planck Temperature is defined as :

Tₚ =√((h×c⁵)/(G×k_B²)) =(mₚ×c²)/k_B 

Tₚ ≈ 1.416808×10³² K ;

where mₚ is the Planck mass

c is the speed of light

h is the Planck's constant 
k_B is the Boltzmann constant

G is the gravitational constant.

In the SI units, the Planck Temperature is about 1.417×10³² kelvin which is equal to 2.55×10³²℉ = 1.42×10³²℃ which is the value of the Absolute Hot. It is the theoretical upper limit to the thermodynamic temperature scale and the contemporary models of physical cosmology postulates that the highest possible temperature is the Planck Temperature (Tₚ). Hence if an object were to reach the temperature of Planck Temperature Tₚ, then the radiation emitted by the object has a wavelength of Planck length, at which point the particle energies become so large that quantum gravitational effects would also become so strong.