Infrared

[nuttaphong191]

can infrared lights(signal?) go through solids or liquids?

 

[Steve_hi]

Water absorbs infrared light so water will decrease the brightness of the infrared signal.

 

[bose-einstein]

Infrared light can go through liquid though its highly attenuated in some of them .
Light does not go through solids except glass.
I hope  you are satisfied now.