Post on 04-Jan-2016
kinetic energy
temperature
Thermal Energypotential
energieshttps://www.youtube.com/watch?v=Hsu3JoXN-qU
The particles inside and outside of the house are always moving.- Inside where it’s warmer the particles are moving faster than outside where it is colder.
Temperature ScalesTemperature is given in different
You can measure temperature in three different scales:
Fahrenheit Scale (oF)Celsius Scale (oC)Kelvin Scale (K)
scales
Fahrenheit (oF)Named after German Physicist Daniel FahrenheitMost common in the USA
Freezing point is
Boiling Point is
180 divisions between boiling and freezing.
32 oF
212 oF
Celsius (oC)Named after Sweedish Astronomer Anders Celsius
Most widely accepted around the world
Freezing Point
Boiling Point
Centigrade scale – 100divisions between boiling and freezing.
0 oC
100 oC
Kelvin (K)International standard of scientific measurement
Freezing point
Boiling point
The lowest possible temperature for any material is
If a material is the particles in that materialand would no longer have
This is called
273 K
373 K
0 K
0 Kwould not be moving kinetic
energy
absolute zero
Absolute zero – No more thermal energy (heat) can be removed from matter. (-273oC or 0 K)
Converting UnitsCelsius to Kelvins
Formula:
Practice problemIf it was 10oC what would it be in Kelvins?
Measuring Temperature are what we use to
Thermometers tell you the of
the surrounding the thermometer.How it works:The of the tube getsThe particles of the (alcohol) inside
and the liquid .The of the alcohol indicates the
Thermometers
measure temperaturetemperatu
rematter
outside
heatedliquid speeds up
spreads outheight temperatu
re
Thermal ExpansionExpansion, or increase in size of a substance
caused by heat.This occurs in all phases of matter when their
temperature rises.
Knowing how molecules are arranged in a solid, liquid and gas, how do you think thermal expansion will occur in each?
Thermal ExpansionSolid –
Liquid –
Gas -
Expand the least
Expands more than solid but less than gas
Expands the most
Thermal ContractionA decrease in the size of a substance caused
by decreasing temperature.
What happens if you take a balloon outside on a cold day? Why (what happens to the particles)?
The balloon would decrease in size because the particles slow lose thermal energy (which includes kinetic energy) and come closer together.
Using Thermal EnergyRemember:
Energy cannot be Many devices energy from one
form to another or it from one place to another, but the amount of energy .
created or destroyedtransfor
mtransferdoes not change
Heating ApplianceA device that converts
electric energy into thermal energy.
Examples:
Most appliances get warm when plugged in because
A device that regulates the temperature of a system.
Applies the properties of
Thermostats
Curling iron, toaster, clothes iron
thermal expansion
Some electric energy is always converted into thermal energy in an electronic device.