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Sunscreen Research Paper

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UV Rays are rays of light coming from the sun that are invisible to the naked eye. There are various types of UV rays: UV A, UV B, UV C. Whilst UV C is harmless; UV A and UV B are harmful to humans. UV B is the most harmful to humans as the wave length is the longest out of them all, which in turn can enter deeper into human skin which cause skin cancer and sun burn when exposed for a long duration
The ozone layer is a layer in the Earth’s atmosphere, which helps block UV rays from hitting earth. It is made up of O3 particles, which helps absorb energy from UV rays that come through allowing for it to not do any harm. A critical problem currently occurring in the world is that pollution is causing the amount of ozone to decrease and break down. …show more content…

Sunscreen either reflects the UV rays from your skin or it absorbs the UV rays and dissipates the energy through heat. Sunscreen use can help prevent melanoma and squamous cell carcinoma (2 types of skin cancer). Sunscreen is measured by SPF (Sun protection factor) which is rated by the fraction of sunburn-producing UV rays that reach the skin. For example ‘SPF 5’ means that 1/5th of the burning radiation will reach the skin (assuming sunscreen is applied evenly at a thick dosage of 2 milligrams per square centimeter).

Research Question
Does the SPF factor of sunscreen affect its ability to block UV Rays?

Hypothesis
The higher the SPF, the more effective it is in blocking UV Rays

Equipment
-Glass slide x21
-Glass lens cover x21
-Sunscreen (Different SPFs)
-Light …show more content…

It shows that SPF really does aid in blocking the amount of sunlight and it is noticeable how the higher the SPF is, the more effective it would be in blocking UV Rays.
The noticeable difference is clearly due to the SPF Factors. This is reliable as all sun blocks were from the same brand called ‘Calypso’ and not a mixture of brands as different brands may include different chemical properties in their sun block. Even though brands may have different chemical properties, the trend should be similar as SPFs are regulated by the government and quality control in order for it to provide the service that customers look for. Therefore in general, most brands should have less light penetrating as the SPF increases.
This is useful to me and people living in Thailand as it is a very hot country where the sun is up all year around and has similar sun light level and temperature on most days. This way, no matter what brand we choose, we know that the higher SPF works more effectively in protecting our skin from sunburns and skin

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