3 ms·
0.2 watts is 172 (k)calories per hour, which isn't all that small (in addition extra load on the rest of the body, such as the heart, lungs, liver, etc. to supp
by jmalicki 4y ago
0.2 watts is 172 (k)calories per hour, which isn't all that small (in addition extra load on the rest of the body, such as the heart, lungs, liver, etc. to support that metabolism)
- thicknavyrain 4y agoForgive me if I'm being dense, but that number seems really implausible to me. 172 kCal an hour is (assuming just waking hours consume calories) about 2700 kCal just from the cortex over the course of a day, which is more than the average Total Daily Energy Expenditure.
- SemanticStrengh 4y agoWould that mean 0.2 watt is the maximum energy expenditure of the cortex and not the average?
- rich_sasha 4y agoI’m usually bad at arithmetic, but I think it’s only 172 cal ie 0.172 kcal, no? 0.2W x 3600s -> 720J -> 172 cal
- KennyBlanken 4y agoFurther, the human body is only about 30-40% efficient at turning calories into work.
- dahart 4y agoYou mean cal, not kcal.
- dredmorbius 4y agoYou're missing a conversion here. 0.2 watt is 172 small calories. A large "food Calorie" is a kilocalorie, the energy required to heat one kilogram of water by 1 degree C. The small gram calorie is the energy required to heat one gram (or one mililitre) by one degree C. These may be distinguished by a large or small 'c', where "Calorie" -> kilogram calorie and "calorie" -> gram calorie. I prefer spelling out "kilocalorie" where there's any possibility for confusion. 0.2 watt is 0.172 kilocalories per hour, or about 4 kcal/day.
- goodpoint 4y agoNo, it's 172 calories per hour, not kcal, which is absolutely tiny compared to our metabolism. "The average human, at rest, produces around 100 watts of power" http://large.stanford.edu/courses/2014/ph240/labonta1/ http://large.stanford.edu/courses/2014/ph240/labonta1/