2 ways to measure temperature that do NOT involved technology
1. Nerve endings in human skin
2. Colour of light given off by a material
100
mechanical or electrical devices used for measuring temperature.
thermometer
100
What temperature (in celsius) do scientists predict is "absolute zero"?
-273.15 degrees celsius = 0 Kelvins
100
All thermometers contain 3 things. What are they?
a sensor, a signal, and a responder
100
How does a thermocouple work?
1. Wires made up of 2 different materials are twisted together
2. When the wires are heated, an electric current is created
3. The electric current is read by a computer
200
Give an example of a situation that you can "touch" something to determine it's temperature
Doctors and nurses checking body temperatures
200
How many "scales" are there that we can measure temperature with?
3
200
What are the units of temperature on the Kelvin Scale called?
Kelvins
200
a material that is affected by changes in temperature
Sensor
200
What can a bimetallic strip be used to control?
furnaces, air conditioners, refridgeratos
300
Give in example of a situation when you can estimating temperature using sight
Welders and glassblowers watching the colour of flames to see when it is hot enough to soften metal or glass.
300
Name (and spell correctly) ONE of the temperature scales
Celsius, Fahrenheit, Kelvin
300
What is the freezing temperature of water according to the Kelvin Scale?
273 K
300
The sensor produces a _______________ - information about the temperature (such as an electric current)
Signal
300
Explain how a bimetallic strip works
1. Two metals are joined together
2. As the strip is heated, on metal expands more than the other, forcing this strip to coil upwards
3. Movements of this strip can operate an electrical switch
400
true of false:
measuring temperature without the aid of technology is accurate
false
400
What did early designs of thermometers lack that was really important in measuring temperature?
Scales
400
True or False: Some things never freeze at all.
True. (Like what?) --> Helium
400
The signal informs a ______________: a pointer, a light or other mechanism that interprets the signal in some way
Responder
400
What is a good tool to use to record changes in remperature over a long period of time?
a) recording thermometer
b) bimetallic strip
c) thermocouple
d) infrared thermogram
recording thermometer
500
What temperature (in degrees Celsius) should your internal temperature remain at?
37 degrees celsius
500
Where does the "Kelvin Scale" start?
Absolute Zero
500
Explain "Absolute Zero"
Temperature is really just a measure of how much things are moving. At absolute zero, they're barely moving. Most chemical reactions slow down or become impossible. Matter becomes more ordered and come together to form waves.
500
What is a good device to measure HIGH TEMPERATURES?
A thermocouple
500
How could a homeowner use an infrared thermogram to reduce heating costs and conserve fuel?