Black t shirts and blackbodies

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In summary: In fact, black objects are good emitters of thermal radiation in the shortwave range due to the absorption of short-wavelength radiation by the black body's surface.
  • #1
pkc111
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Wearing black at night...is it true that wearing a black t shirt on a hot night at night will make you cooler than a white t shirt? Has this got anything to do with blackbody radiation?
 
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  • #2
pkc111 said:
Wearing black at night...is it true that wearing a black t shirt on a hot night at night will make you cooler than a white t shirt? Has this got anything to do with blackbody radiation?
I would think it depends on a couple of things... how hot the surroundings are and whether it is 'black' at infrared wavelengths.
In a hot dry environment, above body temperature, it might be more important to keep thermal radiation out. Your sweat will cool you down.
 
  • #3
the idea is that black colour dissapates heat faster,
the concept stems from the below example

in desert nations, workers dress as to how often their in the shade
if your walking from shady spot to shady spot, and spending time in that shade
you wear dark colours, you get sweaty cause of the layers but in the shade
you cool faster as the wind blows through

likewise if your is the sun a lot you wear light coloured clothes to not absorb as much heat
and the wind blowing through your clothes evaporates the sweat and circulates a cooler air
about your body

but its the wind powerd evaporation that's doing the most of the cooling

at night your not dealing with solar radiant absorption, but keeping your body from absorbing heat
from the air or nearby warm objects
again wind and evaporation is going to be the major factor

so, yes a black shirt will shed heat faster than a white one, but in the instance of clothes
the difference is very minimal, perhaps unnoticable

now if you change the question to "will a steel body car..."
the metal of the black car should cool off faster in the shade/dark than a white car
at a noticable degree of diferance

but there's always the factor of airflow, cause if there's no airflow, the lingering warmth
means a slower/longer cooldown time
 
  • #4
Alt-Bringer said:
the idea is that black colour dissapates heat faster,

Remember that just because something is black does not mean that it is a good emitter of far infrared radiation.
 

What is a black t-shirt and blackbody?

A black t-shirt is a piece of clothing that is completely black in color, absorbing all wavelengths of light that hit it. A blackbody is an object that absorbs all incident electromagnetic radiation, regardless of wavelength or angle of incidence.

Why do black t-shirts and blackbodies appear black?

Black t-shirts and blackbodies appear black because they absorb all wavelengths of light that hit them, reflecting little to no light back to our eyes.

What is the relationship between black t-shirts and blackbodies?

The relationship between black t-shirts and blackbodies is that both are capable of absorbing all wavelengths of light, with black t-shirts being a real-life example of a blackbody.

How do black t-shirts and blackbodies affect temperature?

Black t-shirts and blackbodies are known to absorb and radiate heat more efficiently than other colors or objects. This is because they absorb all wavelengths of light, converting them into thermal energy and increasing the temperature of the object.

Are black t-shirts and blackbodies the only objects that absorb all wavelengths of light?

No, there are other objects that can also behave as blackbodies and absorb all wavelengths of light. However, black t-shirts are a common and easily accessible example of a blackbody. Other examples include black paint, asphalt, and outer space.

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