Cars and Temperatures

With some hot temperatures around here recently, I got to thinking about what people think is hot compared to what a car thinks is hot.

Actually the thought process started years ago during a trip to the Badlands. As the temperature was well over 100 (note all temperatures here will be in F not C), I was worried about the car. I knew I would be unhappy being in the sun (no shade in sight, and you can see a long way in that area of the country) with the temp being 105. And I wondered if the minivan was equally unhappy.

It’s easy to tell in general, because cars have a temperature gauge. As long as the needle stays in the middle of the gauge, everything is happy. But I have also learned that if the needle starts leaving the good zone, something is bad and it’s too late to do much about it other than turn off the engine.

But I’ve since realized that what we think are hot temperatures are not hot to the car. It was replacing a thermostat and radiator that helped me understand that. The thermostat was rated for 195 – that’s the normal operating temperature of the engine coolant.

My body’s thermostat, however, is around 98.6 degrees, about half that of the car. So although I’m in danger of overheating in 105 degree weather, the car is not. Going from 80 to 100 degrees is significant to people, but to a car that would feel like going from 40 to 50 degrees to us.

It’s like dog years – a car degree is half a people degree.

Recalling my thermodynamics class back in college: heat moves from the hotter object to the cooler object, like water flowing from a higher point to a lower point. Once the air gets above 98.6-ish, I’m not longer giving off heat, I’m absorbing it. But for a vehicle, that point is 195. And if the air temperature is even close to that we have bigger problems.

And when the sun came up God designated a scorching east wind, and the sun beat down on Jonah’s head so that he became faint, and he begged with all his soul to die, saying, “Death is better to me than life!”

Jonah 4:8

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This little article thingy was written by Some Guy sometime around 3:13 pm and has been carefully placed in the Driving, Ponder category.

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