Learning Goal Given a temperature calculate a corresponding temperature on another scale 33 Temperature Temperature is a measure of how hot or cold an object is compared to another object ID: 916854
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Slide1
A digital ear thermometer is used to measure body temperature.
Learning Goal Given a temperature, calculate a corresponding temperature on another scale.
3.3 Temperature
Slide2Temperature
is a measure of how hot or cold an object is compared to another object.indicates the heat flow from the object with a higher temperature to the object with a lower temperature.is measured using a thermometer.
Temperature
Slide3The
temperature scales
are Fahrenheit (°F) and Celsius (°C).The temperature difference between boiling and freezing of water are divided into smaller units called degrees.On the Celsius scale, there are 100 degrees between the boiling and freezing points of water. On the Fahrenheit scale, there are 180 degrees between the boiling and freezing points of water.
Core Chemistry Skill
Converting between Temperature Scales
Temperature Scales
Slide4Scientists have learned that the coldest temperature possible is −273
°C. On the Kelvin scale, this is called absolute zero and is represented as 0 K.The Kelvin scale has units called kelvins (K). no degree symbol in front of K to represent temperature. no negative temperatures. the same size units as Celsius: 1 K = 1 °C.
Kelvin Temperature Scale
Slide5A comparison of the Fahrenheit, Celsius, and Kelvin temperature scales between the freezing and boiling points of water.
Temperature Scales
Slide6A. What is the temperature at which water freezes?
1) 0 °F 2) 0 °C 3) 0 KB. What is the temperature at which water boils? 1) 100 °F 2) 32
°F 3) 373 KC. How many Celsius units are between the boiling and freezing points of water? 1) 100 2) 180 3) 273
Study Check
Slide7A. What is the temperature at which water freezes?
2) 0 °C B. What is the temperature at which water boils? 3) 373 KC. How many Celsius units are between the boiling and
freezing points of water? 1) 100
Solution
Slide8To convert temperatures between the Celsius and Fahrenheit scales, we adjust for the size of the degrees. There are
100 degrees Celsius between the freezing and boiling points of water.180 degrees Fahrenheit between the freezing and boiling points of water.Therefore, 180 degrees Fahrenheit = 100 degrees Celsius
Converting between °C and °F
Slide9Adjusting for the different freezing points, 0
°C and 32 °F, we can write temperature equations to convert between Fahrenheit and Celsius temperatures.
Converting between
°
C and
°
F
Slide10Guide to Calculating Temperature
Slide11Example:
A person with hypothermia has a body temperature of 34.8 °C. What is that temperature in degrees Fahrenheit? STEP 1 State given and needed quantities.
STEP 2 Write a temperature equation. ANALYZE Given NeedTHE PROBLEM 34.8 °C T in °F
T
F
= 1.8
T
C
+ 32
Solving a Temperature Problem
Slide12Example:
A person with hypothermia has a body temperature of 34.8 °C. What is that temperature in degrees Fahrenheit? STEP 3 Substitute in the known values and calculate the new temperature.
Three SFs Exact TF = 62.6 + 32 = 94.6 °F Answer to the tenths place
T
F
= 1.8(34.8) + 32
1.8 is exact; 32 is exact
Solving a Temperature Problem
Slide13Temperature Comparison
Slide14On a cold winter day, the temperature is –15
°F. What is that temperature in degrees Celsius?A. −85 °CB. −47 °C
C. −42 °CD. −26 °C
Study Check
Slide15On a cold winter day, the temperature is –15
°F. What is that temperature in degrees Celsius? STEP 1 State given and needed quantities.
STEP 2 Write a temperature equation.
ANALYZE Given Need
THE PROBLEM
–15
°
F
T in °C TC = TF − 32 1.8
Solution
Slide16On a cold winter day, the temperature is –15
°F. What is that temperature in degrees Celsius? STEP 3 Substitute in the known values and calculate
the new temperature. Answer to the ones place Answer is D.
32 is exact; 1.8 is exact
Solution
Slide17What is the normal body temperature, 37
°C, in kelvins? 236 K 310. K 342 KD. 98.0 K
Study Check
Slide18What is the normal body temperature, 37
°C, in kelvins? STEP 1 State given and needed quantities.
STEP 2 Write a temperature equation. ANALYZE Given NeedTHE PROBLEM 37 °C T in K
T
K
=
T
C
+ 273
Solution
Slide19What is the normal body temperature, 37
°C, in kelvins? STEP 3 Substitute in the known values and calculate the new temperature.
TK = 310. K Answer is B. TK = 37 + 273
Solution