Units and Measurements
Text Pgs. 32 - 35
SI – system of units used internationally
Base unit – system of measurement based on an object or event in physical world.
•
time, length, mass, temperature
• Your turn
• Copy Table 2.1 on Page 33 into your notebook
Temperature
• Measurement of the average kinetic energy of the particles which make
up an object.
• Fahrenheit
• Water boils at 212 F
• Water freezes at 32 F
• Celsius
• Water boils at 100 C
• Water freezes at 0 C
• Kelvin
• All particles at their lowest possible energy state
• Water boils at 373.15 K
• Water freezes at 273.15 K
How to convert between Fahrenheit, Celsius and Kelvin
Convert between Fahrenheit and Celsius
F = 1.8(⁰C) + 32
• To convert from Fahrenheit to Celsius all you have to do is put the Celsius
temperature into the equation.
If it is 22 C⁰ what is in ⁰F?
⁰F = 1.8(22) + 32
⁰F = 39.6 + 32
⁰F = 71.6
Convert Fahrenheit to Celsius
• It is 100⁰ F how warm is it in Celsius?
• C = F - 32
1.8
• C = 100 – 32
1.8
37.7 = ⁰C
Your chance to practice
• 21⁰C = ⁰F
• 100⁰C = ⁰F
• ⁰C = 90⁰F
Converting to Kelvin
• To convert from Celsius to Kelvin
• You add 273 to the Celsius temperature
• To convert from Kelvin to Celsius
• You subtract 273