 The water heater is keeping the water at a certain temperature. Here it indicates that it's keeping it at 208, but no unit is written around it. So 208W is the Celsius, Fahrenheit, Rankine, Kelvin. What do you think? 208W, Celsius, Fahrenheit, Kelvin, or Rankine. So let's look at these temperature scales to think about what they can be. So as we have a water heater, so let's look at the properties of water in all of these temperature scales. When does it boil and when does it freeze? So in Celsius, the definition, let's actually define over the boiling and the freezing point, zero degrees Celsius is freezing and 100 degrees Celsius is boiling. So could the 208 be Celsius? No, the water was definitely liquid in the water heater, so Celsius is out. Let's look at Fahrenheit. Fahrenheit we have freezing at 32, boiling at 212, 208, could be Fahrenheit, right? So Kelvin, Kelvin freezing is at 273, boiling at 373, the water was not frozen, so Kelvin is out. Then Rankine, we had boiling at 671 and freezing at 491, so Rankine is out. So in the end I'm concluding that it must have been Fahrenheit, where we had 208 degrees Fahrenheit.