Why are thermos’s better at keeping things cold rather then keeping things hot ?

Question

Why are thermos’s better at keeping things cold rather then keeping things hot ?

In: 4

Answer 1

The *rate* of heat transfer is based on the difference in temperature between two places.

Let’s assume it’s normally around 70F outside of a thermos.

A cold drink might be around 35-40F. That’s an approximately a 40F temperature difference at *most*.

A hot drink might served around 180-190F. That’s approximately a 110F temperature difference at *least.*

Since the difference in temperature affects the rate of cooling, and hot drinks are usually much hotter than room temp than cold drinks are cooler than room temp, hot drinks cool off faster.