Use the worked example above to help you solve this problem. The temperature gradient between the skin and the air is regulated by cutaneous $($skin$)$ blood flow. If the cutaneous blood vessels are constricted, the skin temperature and the temperature of the environment will be about the same. When the vessels are dilated, more blood is brought to the surface. Suppose that during dilation the skin warms from $73\mathrm{.}4$F to $79\mathrm{.}4$F$.$

$($a$)$ Convert these temperatures to Celsius and find the difference.