Lec 6 Flashcards
How are weather stations standardized!
To sea lvl equivalent. Via the ideal gas law
What is heat
The transfer from are object to another.
How does wind remove heat?
It is effective at removing master.
What are the units of energy?
Mass x velocity squared.
What is energy? What are the 2 type?
A property of matter that can do work ( make things happen)
Kinetic and potential
Kinetic energy
The energy of a mass in motion
1/2 mass x (velocity squared)
How is energy measured?
In joules (kg/(m^2xs^2)
Potential energy
E associated with an objects position ( and turn into kinetic energy)
This can be mechanical or
Chemical
Internal energy
The total energy in a system (kinetic and potential)
How is transferred from are object to another?
Conduction + connection
Conduction
Heat transfer from one mole to the next through or between contacting objects I substances
Which physical state conducts energy the best?
Solids! This is because all atoms in a solid are “connected” and always touching.
Then liquid and then gas
How does temp gradients influence conduction rates? Chi
Larger diff in temps the larger conduction will occur.
How is conduction measured?
Via heat flux:
Qc=-k x dT.
dT= (Change in temp) over a distance
-k = thermal conductivity coefficient (W/mK) (how well heat transfers
How is heat transferred from the ground into the air?
Via conduction - at the laminar layer
What is convection
The transfer of energy through the movement of liquids and gases
What are the types of convection
Thermal or mechanical
Thermal is based on density of medium
Mechanical is based en movement
What is the heat flux equation for convection
Q (H)= -k x dT
dT= temp change btwn 2 pts
-K= Eddy diffusivity (E transfer via mixing motion)
Where does convection primarily accuse?
In the atmosphere.
Large contributor to storm cloud formation
What is sensible heat?
E transfer that can be measured with a thermometer (measurable heat change of an object)
What is specific heat
Amount of energy (heat) required to raise the temp of 1 kg of a substance by 1° k
What is latent heat?
The heat associated with phase change.
Not measurable by a thermometer
Does melting or evaporation require or release heat?
Requires
Does freezing or condensing require or release heat?
Releases
