what is convection and raditation?

Question

in science i need to make a postor of the two types of heat tranfer..ive been absent so what picture could i draw for raditaion and what for conduction?
ps: it has to be and object

and also can someone please define conduction and radiation?

Answer 1

for radiation - how about someone sitting under the sun? Radiant energy is what heats you from the sun.

For convection (you seem to change your mind if you want convection or conduction info) you could think in terms of how a convector heater works - the warm air circulating the heat around the room. Convection also applies to liquids too - think of the water in the kettle and the water currents inside making all of the water heat more-or less together.

For conduction, how about a saucepan sitting on top of a cookers' hotplate?

Heating by radiation is through infrared heat - from the sun, from a light bulb - even a bonfire but that can also be from convection too. Think in terms of "heatwaves" with radiation perhaps.

Conduction of heat is when two surfaces of dissimilar temperature are brough together. Some of the heat will travel by conduction (touching) to the cooler object.

Answer 2

Convection is the internal movement of currents within fluids (i.e. liquids and gases). It cannot occur in solids due to the particles not being able to flow freely One example is that of buoyant convection when water is heated in a pot on a stove

Radiation is in every part of our lives. It occurs naturally in the earth and can reach us through cosmic rays from outer space. Radiation may also occur naturally in the water we drink or the soils in our backyard. It even exists in food, building materials, and in our own human bodies.

Radiation is used for scientific purposes, medical reasons, and to power some submarines. We can also come into contact with radiation through sources such as X-rays, nuclear power plants, and smoke detectors

Conduction is a point-by-point process of heat transfer

Answer 3

as you say they are all means of heat transfer.
in convection the transfer is within a medium, (i'm not talkin about size here.)like in air or water.
while radiation happens in the absence of a medium ,like in a vaccum(like outer space.)
so a good model would be a picture of the sun.
inside the sun(heat moves from the inner part of the sun to the outer) would be convection, while from the sun to the earth would be radiation.
conduction is the transfer of heat by direct contact, picture yourself touching a hot bowl of soup.
friend, you need to work on your spelling.(try using the spell checker.)
God bless,
gabe