the skin protects us from mechanical damage, chemical damage, bacterial damage, ultraviolet radiation, thermal, and desiccation.
Physical,if you use your 5 senses for it its physical
Skin tanning is an example of a chemical reaction.
"sunburn" results from physical damage caused to your skin by overexposure to Ultraviolet emissions, usually from the sun but it can also come from a UV lamp. UV light affects damage to the DNA of your skin cells. In defense those cells will produce melanin, a chemical response to try to repair this damage, which also darkens the color of the skin ( a "sun tan").
It's a physical change, ink is forced into your skin via a mechanized needle. It remains there for the rest of your life, or until removed by surgical means.
This is a chemical reaction.
chemical
Physical,if you use your 5 senses for it its physical
It is a physical change.
This phenomenon is of physical nature.
Chemical.
Skin tanning is an example of a chemical reaction.
It is a physical change. Preexisting pigments are moved to and from the surface of the skin, but the pigments themselves do not change.
It is a Physical change because it is changing the color of your skin not any chemicals in your body.
its a physical because its a change in the state of matter just like boiling water
it is a chemical barrier because it produces tears that are chemicals. also- for your information, skin is a physical barrier along with the nose and mucus and cilia. sebum and stomach acid are chemical. :D
Evaporation of any fluid is a change of state and therefore (like all C.o.S.) it is a physical change.
If you cut an apple and keep, the colour changes to brown. This is physical change. Apple has iron (in the form of ferrous salts). The colour is due to the formation of harmful ferric compounds and this is a chemical change (conversion of ferrous to ferric).