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Required information

A $13\mathrm{.}5cm13\mathrm{.}5cm$ vertical chip has a constant surface temperature of $150C.$

Determine the Grashof number when the chip is placed in air $(1$ atm, $30C).$

Given: The properties of air as follows:

$T_k^{\text{'}}C=90$

p$.k\frac{g}{m^3}=0\mathrm{.}9718$

$,k\frac{g}{m}*s=2\mathrm{.}139{10}^{-5}$

B$,K^{-1}=2\mathrm{.}755{10}^{-3}$