fill the blanks -6

The temperature does not change during a .....although the amount of energy added is large.

phase transition

The internal energy of a substance includes both potential energy of intermolecular forces and kinetic energy of.... motion.

random

The energy required to melt Ig of a solid at its melting temperature is referred to as ...... for that substance.

the latent heat of melting

If there is a well stirred mixture of ice and water at thermal equilibrium in a container, then the temperature of the mixture is......

0°

If a liquid is forced to evaporate, it will act as a .... agent

cooling

A refrigerator must extract heat from a..... region and release it into a region of ..... temperature.

cold ; higher

The energy required to melt a mass m of a substance can be calculated by.....

Q=m hf

We feel warmer on a humid day because the level of moisture in the air inhibits the evaporation of....

perspiration

Ice is much more effective as a cooling agent than cold water because of ..... required to melt the ice.

internal energy

The mass of water vapor per unit volume of saturated air is the....

saturation vapor density

..... of any liquid is the temperature at which the vapor pressure is equal to the atmospheric pressure.

boiling point

Steam has.... internal energy than water and water has.... internal energy content than ice.

higher ; higher

When ice melts into water, it absorbs thermal energy from its surroundings, but does not change.....

temperature

The most common units for the vapor density are.....

g/m^3 ; kg/m^3

Assume the air is progressively cooled while maintaining the moisture content constant. Then the relative humidity will... until it reaches....

rise ; 100%

Boiling point of any liquid is the.....at which the vapor pressure is equal to the atmospheric pressure.

temperature

The temperature at which the moisture content in the air saturates it is called the....

dew point

The transfer of internal energy mainly occurs by one of the following three mechanisms:...

1)conduction ; 2)convection ; 3) radiation

The efficacy of heat conduction depends on the.... of collisions and..... transferred during each collision.

number ; amount of energy

..... is the main mechanism for heat loss from buildings
in winter.

radiation

The quantity DT/ Dxis referred to as...

thermal gradient

Fourier's law tells us that doubling the thickness of a clothing will ...... the rate of heat loss from the body.

halve

Central heating systems, which heat and circulate a closed volume of air, will.....the relative humidity.

reduce

..... refers to heat transfer by the movement of fluids.

convection

Air is a poor conductor, but it can efficiently transfer heat by....