Convert between Celsius, Kelvin and Fahrenheit

Answer Key - Grade 10 Science Worksheet - Building Confidence

Circle the best answer, or write your answer on the line.

1. 1.

   Ari's thermometer reads 5 °X in melting ice and 85 °X in boiling water. What does it read at 40 °C?

   37 °X
2. 2.

   Bo's thermometer reads 20 °X in melting ice and 220 °X in boiling water. What does it read at 30 °C?

   80 °X
3. 3.

   Esme's thermometer reads -10 °X in melting ice and 150 °X in boiling water. What does it read at 25 °C?

   30 °X

4. Read this first

   Reference temperatures (real data, NIST)

   point	kelvin (K)	Celsius (°C)	Fahrenheit (°F)
   absolute zero	0	−273.15	−459.67
   liquid nitrogen boils	77.36	−195.79	−320.42
   dry ice turns to gas	194.65	−78.5	−109.3
   water freezes	273.15	0	32
   a room	293.15	20	68
   water boils	373.15	100	212

5. 4.

   A freezer runs at −18 °C. What is that in kelvins, Jun?

   • 291.15 K
   • 255.15 K
   • −255.15 K
6. 5.

   A recipe says 350 °F. Which Celsius value matches, Kira?

   • About 194 °C
   • About 177 °C
   • About 662 °C
7. 6.

   How many kelvins colder is boiling liquid nitrogen than subliming dry ice, Luz?

   • 117.29 K
   • 272.01 K
   • 211.12 K
8. 7.

   A thermometer reads 3 °C too high at every temperature. It reads 50 °C in a drink. What is the true temperature, Noah?

   • 50 °C, the reading itself, since the error is small
   • 47 °C: subtract the 3 °C error
   • 53 °C: add the 3 °C error to the reading
9. 8.

   A room warms from 20 °C to 25 °C. How big is that change in kelvins, Pia?

   • 9 K, since kelvins are 1.8 times bigger than Celsius degrees
   • 5 K, since a kelvin and a Celsius degree are the same size
   • 298.15 K, the new reading in kelvins after the change
10. 9.

    Water warms from 20 °C to 50 °C. Which temperature change goes into q = mcΔT, Ren?

    • 70 °C
    • 323.15 K
    • 30 °C

11. Reference temperatures (real data, NIST)

    point	kelvin (K)	Celsius (°C)	Fahrenheit (°F)
    absolute zero	0	−273.15	−459.67
    liquid nitrogen boils	77.36	−195.79	−320.42
    dry ice turns to gas	194.65	−78.5	−109.3
    water freezes	273.15	0	32
    a room	293.15	20	68
    water boils	373.15	100	212

12. 10.

    Which statement about 0 K is true, Zee?

    • It is the freezing point of water on the kelvin scale
    • It is the coldest anyone has reached, and colder is possible
    • It is absolute zero; nothing is colder, so kelvin readings are never negative