Thermo
What is temperature?
Temperature is the measure of the average kinetic energy in a substance.
Which type thermometer can see the temperature of a surface from a distance?
Infrared
50°C
50 × 1.8 = 90
90+32=122°F
50°F
50 –32 = 18
18 / 1.8 = 10°C
List the three methods of heat transfer
Conduction, Convection and Radiation
What is the first color of light that can be seen when a piece of metal is being heated?
Red
What two metals are joined to create a Type K thermocouple?
Chromel and alumel
25°C
25 × 1.8 = 45
45+32=77°F
104°F
104 – 32 = 72
72 / 1.8 = 40°C
List two materials that are considered to be good thermal conductors
Copper and aluminum
How does a glass stem thermometer measure temperature?
Expansion and contraction of the fluid makes the liquid level rise and fall with temperature.
What are the two points used to create the Celsius temperature scale?
Freezing point of water = 0° and boiling point of water = 100°
150°C
150 × 1.8 = 270
270 + 32 = 302 °F
158°F
158 – 32 = 126
126 / 1.8 = 70°C
Define sensible heat.
A sensible heat process causes a change in temperature.
What causes the pointer to move on a dial type thermometer?
The bi-metal element expands with temperature rise and contracts with temperature fall.
The Rankin temperature scale uses the same spacing between degrees as which other system?
Fahrenheit
350°C
350 × 1.8 = 630
630 + 32 =662 °F
356oF
356 – 32 = 324
324 / 1.8 = 180°C
Define latent heat.
Latent heat refers to a heat transfer that causes a change in state but not a change in temperature.
What is an advantage of digital thermometers?
Easy conversion between °F and °C, temperature averaging, minimum and maximum temperature
Define condensation
Condensation – changing from a gas to a liquid when heat is removed from a gas