Question

Which gas has the lowest thermal conductivity?

Answer 1

1. The ability of any material to transfer or conduct heat is called the thermal conductivity of the element.
2. The metals are good conductors and so they possess higher thermal conductivity.
3. Thermal conductivity is generally denoted as $\left(\mathrm{k},\mathrm{\lambda },\mathrm{K}\right)$.
4. The SI unit of thermal conductivity is $\mathrm{W}/\mathrm{m}.\mathrm{K}$
5. The thermal conductivity of gases is least compared with solid as the particles of gases are loosely bound.
6. Generally Hydrogen$(0.18)$ and Helium$(0.15)$ have the highest thermal conductivity whereas Xenon$\left(\mathrm{Xe}=0.0051\right)$, Krypton$\left(\mathrm{Kr}=0.0088\right)$, and Carbon dioxide$\left({\mathrm{CO}}_2=0.0146\right)$ Dichlorodifluoromethane gas$\left({\mathrm{CCl}}_2{\mathrm{F}}_2\right)$ has the lowest thermal conductivities.