Question 15 Marks
Convert $-13^{\circ} F$ into (a) ${ }^{\circ} C$, (b) Kelvin
Answer
View full question & answer→(a) Temperature in Celsius scale, C = 5/9 (F-32)
were F → Temperature in Fahrenheit scale
Temperature in Celsius scale, C = 5/9 (-13-32)
$\Rightarrow C=5 / 9(-45)$
$\Rightarrow C =-25^{\circ} C$
Hence, $-13^{\circ} F =-25^{\circ}$
(b) Conversion of $149^{\circ} F$ into Kelvin:
From (a) $149^{\circ} F =-25^{\circ} C$
Temperature in Kalvin $=$ Temperature in ${ }^{\circ} C +273$
= -25+273
= 248 K
Hence, $-13^{\circ} F =248 K$
were F → Temperature in Fahrenheit scale
Temperature in Celsius scale, C = 5/9 (-13-32)
$\Rightarrow C=5 / 9(-45)$
$\Rightarrow C =-25^{\circ} C$
Hence, $-13^{\circ} F =-25^{\circ}$
(b) Conversion of $149^{\circ} F$ into Kelvin:
From (a) $149^{\circ} F =-25^{\circ} C$
Temperature in Kalvin $=$ Temperature in ${ }^{\circ} C +273$
= -25+273
= 248 K
Hence, $-13^{\circ} F =248 K$