Just about everyone at one time or another has been burned by hot water or steam. this problem compares the heat input to your skin from steam as opposed to hot water at the same temperature.

assume that water and steam, initially at 100? c, are cooled down to skin temperature, 34? c, when they come in contact with your skin. assume that the steam condenses extremely fast. we will further assume a constant specific heat capacity c=4190j/(kg? k) for both liquid water and steam.

how much heat h1 is transferred to the skin by 25.0 g of steam onto the skin? the latent heat of vaporization for steam is l=2.256

Explanation:

Given:

Assuming that no heat is lost in the surrounding.

We know:

Now the total heat given by the steam to form water at the given conditions:

..............................(1)

where:

latent heat given out by vapour to form water of 100°C

heat given by water of 100°C to come at 34°C.

putting respective values in eq. (1)

is the heat transferred to the skin.

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.