Sun lotion is a designed substance that we use to guard from sunburn, skin cancers, and other conditions that cause unrestrained exposure to daylight.
You will call it sun block or sun cream, it may all come into a type of lotion, spray, gel or other contemporary product that defend you from ultraviolet and help protect against second degree burns.
How can sunscreen protect you from sunburn? First of all I will give you a short explanation on how sunlight is danger you our skin.
Sunlight that passes through the ozone layers and enters the Earth has wavelength of 290 - 760 nanometers.
This wavelength is break into three sections, which are range from 290 - 320 nanometers is UVB or ultraviolet ( UV ) and the range from 320 - four hundred nanometers is a UVA and the range from four hundred - 760 nanometers could see with our own eyes, called plain radiation.
These radiations, particularly from UVA and UVB, will create physical and chemical reactions with our skin, which can end up in skin cancers.
So, we have to consider protecting our skin from the dangerous radiation and one of the best tactics is using sunscreen.
There are 2 kinds of how sunscreens protect our skin from sunlight, which are chemically and physically.
Chemical sunscreen absorbs the radiation into the chemical's molecule and converts the radiation into heat, instead of letting the radiation to pass through our skin into the dermis area.
Some sun lotion only soaks up UVA radiation and some sun lotion only soaks up UVB radiation, but there are also sun lotion that could absorb both UVA and UVB radiation.
But not one of the suntan lotion can soak up the plain radiation.
Physical sun lotion reflects the radiation out of our skin.
The 2 most popular chemicals that have a capability of physical sunscreen are Titanium Dioxide and Zinc Oxide, but Zinc Oxide is less white comparing to the Titanium Dioxide and it could reflects the UVB, UVA, and the plain radiations.
Folks who plan to get a sunscreen product should choose rigorously.
The vital considerations before purchasing sunscreen product are the ingredient list.
The ingredient that is added should have a capability to reflect or absorb UVA, UVB and visible light radiation.
We should make sure that the concentration of the ingredient is not too high or not too low because if it's too high it may harm our skin, while if it is too low it could be ineffective.
Another factor to consider is the quantity of SPF ( Sun Protection Factor ) and PA ( protection grade for UVA ).
SPF ( Sun Protection Factor ) is to measure for the capability of the sunscreen how much could it protect from the UVB radiation.
The number of the SPF indicates how often this sun lotion can protect from the UVB radiation.
For instance SPF fifteen, this implies that this sunscreen have ability to guard UVB radiation 15 times from the applier skin.
In the other word, if someone skin gets sun burn after standing in the sun for fifteen - 30 minutes and if this person applies SPF fifteen suntan lotion lotion on the skin, this sunscreen will protect the skin from third degree burns fifteen times, which will be around three - 4 hours.
PA ( Protection grade for UVA ) is to determine the capability of the sunscreen how much it might protect from UVA radiation.
PA is factor breaks into 3 levels which are PA two - four which can protect some of UVA, PA 4 - 8 can protect UVA radiation moderately or around medium level, and PA eight and above could protect from the UVA radiation the best.