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Excessive exposure over a long period of time can cause skin cancer.
illega exposure
Cold is not really pain but it can cause pain when a person is exposed to cold for a long period of time. Exposure to cold can cause frost bite and damage to the tissues of the body.
The "exposure triangle" in photography applies to the balancing of three controls available to the camera user : aperture, exposure, and film speed. Aperture setting governs the light received, exposure the total light over time, and film speed the resultant image recorded from that light.
No, exposure to radon gas, even a large amount, won't give you a headache. Radon is an inert or noble gas, and it is radioactive. Radon exposure is a bad thing as it is the second most common cause of lung cancer. But you won't be able to detect radon by any of your senses, and it will not directly cause you to be "sick" or for a "migrane" to appear. It will, after time, cause cancer because the radiation damage your lungs get from the long exposure. In the mean time, you won't feel a thing. At least not because of an exposure to radon gas.
Chronic is long term (from chronos- time) Acute responses are quick.
That would depend on its intensity during the brief exposure.
Chronic Exposure
Automatic exposure time electronic exposure time mechanical exposure time
Chlorine can not cause fingernails to fall off unless there is long term exposure to the chemical (no diluted) without the use of gloves. It can possibly cause false nails to fall off if spending an extended time in a swimming pool.
Exposure to some chemicals, over a sufficient period of time, can injure the sinus cavities. It depends entirely on the particular chemicals how long the exposure lasts, and how intense the exposure is.
This depends on the concentration of DDT and the time of exposure.