Thermal Properties Flashcards
What is the attraction force between particles of matter called
Cohesion
Define Heat
It is the energy in transit from an object of higher temperature to an object of lower temperature
Describe the properties of a thermometer
Stem.
Is made from thick glass insulating
Has a thin, uniform bore extending up through stem
Thin walled glass bulb
Filled with mercury or coloured alcohol
Vacuum above column of mercury or coloured alcohol
Describe how you will calibrate a thermometer
Hahaheee
Def range of a thermometer
It is the range in temps (from the lowest to the highest )
that the thermometer is able to measure accurately and
without being damaged
Def linearity
It is the property of a thermometer
which produces a change in thermometric property,
such as expansion of mercury,
which is directly proportional to the change in temperature
Def Sensitivity
It is the property of a thermometer
which results in a small change in temperature causing a large change in the thermometric property
and a quick response to heat
How can you increase the sensitivity of a thermometer
- Reduce the diameter of the bore
- Increase the size of the bulb
- Use a thin walled glass bulb
Def heat
Heat is energy in transit from an object having a high temperature to an object having a lower temperature
Def Specific heat Capacity
It is the quantity of heat transferred when
The temp of 1 kg of substance
Changes by 1 C. Or 1 K
Unit is J kg-1 C-1. Or J kg-1 K-1
What is the formula used in heat loss heat gained reactions
Q = m@c
Q in J. joules
m in kg
c in J.kg-1.C-1
NB. Also remember
W = Pt. (work is pt)
W in Joules.
P = kW
t = s
An electric heater rated 100 kW heats water in certain time
Def heat capacity
The heat capacity of a Given mass of a substance is the amount of heat that must be transferred
In order to change its temp by 1 oC
Symbol = C
Unit. J.C-1
What is the formula to show the link between heat capacity and specific heat capacity
C =cm
Define internal energy
It is equal to the sum of the potential and kinetic energies of the particles of a body
Def latent heat
It is the heat required
to change the phase of a substance
at constant temperature
Def specific latent heat
Is the amount of heat required to
change the phase of
one kilogram of the substance
at constant pressure
Def. Specific latent heat of fusion
Is the quantity of heat required
to melt 1kg of solid into liquid at
constant temperature
Def. specific latent heat of vaporisation
Is the quantity of heat required to vaporise 1kg of liquid into vapour at constant temperature
