sun rays and sun cream
physical factors are the circumference on the sun over the area of a humanoids eye
ice cream melts in the sun because when the heat of the sun get to the ice cream its starts to melt like ice.
Sun cream absorbs or reflecting some of the UV rays from the sun to protect against sun burn.
The ice cream melts in the sun because it is supposed to be frozen but when the sun hits ice cream it takes the ice off of ice cream so it is not frozen.
If you put the ice cream out in the sun, it will melt down.
The cream/lotion you are talking about is sun block.
It depends. Might be "sun cream", "solar" and many other things. Can you make an example?
what is the factors that may cause a decrease in the demand of ice-cream
Yes, Nivea sun cream products have an expiration date printed on the packaging. It is important to check and adhere to the expiration date as using expired sun cream may not provide adequate protection from the sun.
It means you should buy plenty of anti-wrinkle cream and stay out of the sun.
The cream is opaque and reflects the UV rays before they reach the skin's surface.