temperature

Question 1

heat

Answer 1

heat is a form of energy that can flow from one region to another

Question 2

temperature

Answer 2

the temperature of a body is the physical quantity which indicates how cold or hot an object is.

Question 3

heat transfer

Answer 3

when a hotter body is placed next to a colder body, thermal energy will flow from the hotter body to the colder body, this is known as heat transfer.

Question 4

thermal contact

Answer 4

when a hotter body is placed in contact with a colder body , the bodies are said to be in thermal contact.

Question 5

thermal equilibrium

Answer 5

when two objects in thermal contact , reach the same temperature and there is no net energy flow between them, the objects are in thermal equilibrium.

Question 6

zeroth law of thermodynamics

Answer 6

this fundamental law states that if two bodies A and B are separately in thermal equilibrium with a third body C , then A and B are also in thermal equilibrium with each other.

Question 7

fixed point

Answer 7

a fixed is a temperature where all thermometers show the same temperature

Question 8

empirical scale of temperature

Answer 8

it is a temperature scale based on experimental values.

Question 9

egs of empirical scale of temperature

Answer 9

resistance scale, thermoelectric scale , volume of liquid scale

Question 10

effect of empirical scale of temperature

Answer 10

different thermometers give different reading, however all thermometers give same readings at fixed points

Question 11

ice point

Answer 11

the ice point is the temp where ice and pure water are in equilibrium at standard atmospheric pressure.

Question 12

steam point

Answer 12

the steam point is the temp where pure water and and its vapour are in equilibrium at standard atmospheric pressure.

Question 13

numerical scale

Answer 13

it is the temperature interval between ice point and steam point

Question 14

sensitivity

Answer 14

it is the distance moved by the mercury thread per 1° C increase in temperature.

Question 15

thermodynamic scale of temperature

Answer 15

it is a scale of temp based on the properties of ideal gases.
unit = kelvin(K)

Question 16

fixed points of thermodynamic

Answer 16

1. absolute zero
2. triple of water

Question 17

absolute zero

Answer 17

it is the temperature at which no more energy can be removed from any object.
0K = -273.15° C

Question 18

Triple point of water

Answer 18

the point where ice , water and water vapour are in equilibrium.
can be obtained by a triple point cell.
fixed as 273.16K

Question 19

one kelvin

Answer 19

is defined as 1/273.16 x (temp of the triple point of water).

Question 20

energy of molecules

Answer 20

even if a body/system/gas/liquid is at rest, its atoms move or vibrate like in a solid , so that each mole has microscopic Ek,
These atoms have interatomic forces which contribute to microscopic Ep

Question 21

internal energy

Answer 21

It is the sum of randomly distributed Ep and Ek associated with the molecules in a system.

Question 22

heat capacity

Answer 22

It is the qty of heat energy required to raise the temp of a body by 1°C or 1K

Question 23

Specific heat capacity

Answer 23

SHC of a body is the amount of heat energy required to raise the temp of a unit mass of it by 1°C or 1K , without going through a change of state.
Q = mc▲T
Q=energy transferred in J
m=mass of water in g
c=SHC
T=temp ch

Question 24

latent heat

Answer 24

the heat energy which changes the state of a substance.

Question 25

latent heat of fusion definition

Answer 25

The energy needed to melt a solid at its melting point. OR
The energy needed to solidify a liquid at its at its freezing point.

Question 26

specific latent heat of fusion

Answer 26

lf of a substance is defined as the amount of heat required to change the unit mass of the substance from solid to liquid state without changing its temp.
Q = m x lf
Q = amt of thermal energy absorbed or released (J)
m = mass of substance (kg)
lf = specific latent heat of fusion (j/kg)

Question 27

specific latent heat of vaporization

Answer 27

lv of a substance is the amt of heat required to change the unit mass of the substance from liquid to gas state without changing its temp.
Q = m x lv
Q = amt of thermal energy absorbed or released (J)
m = mass of substance (kg)
lv = specific latent heat of vaporization