Lesson 4: Temperature

English vs. Metric Units Which is warmer? 10 degrees F or 0 degrees Celsius B. 100 degrees F or 100 degrees Celsius C. 212 degrees F or 100 degrees Celsius

English vs. Metric Units The U.S. is the only nation that continues to use Fahrenheit temperatures for shelter-level (surface) weather observations. However, as of July 1996 all surface temperature observations in National Weather Service reports are now transmitted in degrees Celsius.

English vs. Metric Units Three temperature scales are in common use in science and industry. Two of those scales are SI metric: The degree Celsius (°C) scale The kelvin (K) temperature scale One is non-metric: The degree Fahrenheit (°F) temperature scale *Our focus will be on the Celsius scale

English vs. Metric Units Some baseline temperatures in the three temperature scales: temperature kelvin degree Celsius degree Fahrenheit symbol K °C °F boiling point of water 373.15 100. 212. melting point of ice 273.15 0. 32. absolute zero -273.15 -459.67

English vs. Metric Units Common temperature comparisons: temperature degree Celsius degree Fahrenheit symbol °C °F boiling point of water 100. 212. average human body temperature 37. 98.6 average room temperature 20. to 25. 68. to 77. melting point of ice 0. 32.

English vs. Metric Units A degree Celsius memory device: There are several memory aids that can be used to help understand the degree Celsius temperature scale. One such mnemonic is: When it's zero it's freezing, when it's 10 it's not, when it's 20 it's warm, when it's 30 it's hot!

English vs. Metric Units Or, another one to help you remember: Thirty is hot Twenty is nice Ten is cool Zero is ice

Temperature conversions between Fahrenheit and Celsius: degree Fahrenheit / degree Celsius conversions (exact): degree F = degree C x 1.8 + 32. degree C = (degree F - 32.) / 1.8 *note: in case you have done this using 9/5 and 5/9 instead of 1.8—they are equivalent.