Temperature
5-9
Compute the new temperature.
Temperature can be measured in degrees
Fahrenheit (°F), or in degrees Celsius (°C).
The temperature was 15°C. It dropped 25°.
What was the new temperature?
To find the new temperature, n, add:
15 25 n
15 25 10
The new temperature was 10°C.
The temperature was 10°F. It dropped to 15°F.
How many degrees did the temperature drop?
To find the number of degrees, n, subtract:
15 10 n
15 10 25
The temperature dropped 25 degrees.
You can use formulas to estimatetemperature.
230 °
120 °
140 °
160 °
180 °
200 °
220 °
130 °
150 °
170 °
190 °
-- 20 °
-- 20 °
-- 40 °
-- 40 °
-- 60 °
-- 60 °
-- 80 °
-- 80 °
10 0°
10 0°
- 20 °
- 20 °
- 0 °
- 0 °
F C
-- 10 °
-- 10 °
-- 10 °
-- 10 °
-- 30 °
-- 30 °
-- 50 °
-- 70 °
-- 90 °
110 °
-- 50 °
-- 70 °
-- 90 °
110 °
210 °
Water freezes
( (^32) °F; (^0) °C)
Room
temperature
( 68 °F; 20 °C)
Normal body
temperature
( 98 .6°F; 37 °C)
A hot day
( 90 °F; 32 °C)
Water boils
( 212 °F; 100 °C)
Estimate 46°F to degrees Celsius.
°C (°F30) 2
( 46 30) 2 Replace F with 46.
8 Simplify.
46°F is about 8°C.
Estimate 2°C to degrees Fahrenheit.
°F (2°C30)
(2• 2 30) Replace C with 2.
26 Simplify.
2°C is about 26°F.
°C (°F 30) 2 °F 2°C 30
Starting Temperature Change in Temperature New Temperature
35°C rises 15°?
5°C falls 10°?
0°C drops 12°?
8°C climbs 4°?
Think
Dropped 25°25°
Think
(10) 10
2.3
8206-2_166-167 10/7/07 11:14 AM Page 166