Answer
$θ /°C=-182.97°C$
Work Step by Step
$θ /°C=T/K-273.15$ or $T/K=θ /°C+273.15$
$θ /°C=T/K-273.15=90.18-273.15=-182.97°C$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.