Suppose a human could live for two hours (120 minutes ) unclothes in a

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manal950
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Suppose a human could live for two hours (120 minutes ) unclothes in air at 45 F . How long could he live in water at 45 F ?

how do the thermal conductivities of water and air compare ?
Air : k = 0.0251 W/mC ,
water = k = 0.597 W/mC


my answer

now for conduction we will say that

-k(air ) .A(dT/dx) dtime = -k(water ) .A(dT/dx) dtw

= 0.025 X 2 / 0.597

= 0.083 second
 
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manal950 said:
= 0.025 X 2 / 0.597

= 0.083 second

Huh?

No idea what is what of what nor how you got the number you got.

What is 2?

And your math is incredibly off.
 
That looks much more palatable.

It won't hurt to include units in your answer.