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In living things its for interacting with the environment.

Q: What is the function of the surface area?

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A surface is where things happen between what is on one side of the surface and the other. Thus in general if you want more of these happenings (eg gas exchange) you need the biggest possible surface area. If however you want to minimise these happenings (eg heat loss) you try and reduce the surface area.

The function of air sacs (alveoli) is to provide a large surface area for gas exchange

The bunsen burner is used to heat items for experiments using a controllable temperature flame and surface area at which the heat is applied to the vessel.

Yes. There are ways to do that, but it depends on what you wish to change the surface area of. Changing the surface area of something like, say, a shotput is difficult, but changing the surface area of a balloon can be accomplished by merely blowing it up (more) or deflating it.

The rate of dissolution of a solid is dependent on the surface area reaction. By crushing the cube, the surface area is greatly increased, thus increasing the rate of dissolution.

Related questions

Increase surface area for food

To increase the surface area for gaseous exchange.

All villi increase surface area.

The surface area is a function of the height (or slant height) and the radius of the base. So, the slant height is a function of the surface area and the base-radius. Since the latter is unknown, the slant height cannot be calculated.

Area = 6s2 where s is the length of an edge.

increased surface area necessary for absorption

increase surface area over which air pass through

It has ribosomes on its membrane and provides surface area for protein synthesis.

The expense to paint the shed is a function of the shed's surface area.

The expense to paint the shed is a function of the shed's surface area.

increase intestine surface area for more efficent absorption of digested nutrients

the answers is the need for a surface area of sufficient area to allow the cell's function