Calculate a temperature difference

Supplied materials

• All measurements and observations below are supplied classroom examples. They are not data from actual learners or a claim about a particular real site.
• Paper or browser document; an ordinary calculator is optional.
• Rule: Temperature difference equals warmer Celsius reading minus cooler Celsius reading. Formula: a-b. Variable key: a = warmer temperature (°C), b = cooler temperature (°C)
• Distinct worked inputs and result: A distinct comparison is 30°C and 22°C: 30-22=8°C difference.
• Assessment case 1: Supplied case 1: warmer temperature (°C)=40; cooler temperature (°C)=20, using the explicitly named quantities. Temperature difference equals warmer Celsius reading minus cooler Celsius reading. What result follows?
• Assessment case 2: Supplied case 2: warmer temperature (°C)=35; cooler temperature (°C)=18, using the explicitly named quantities. Temperature difference equals warmer Celsius reading minus cooler Celsius reading. What result follows?
• Assessment case 3: Supplied case 3: warmer temperature (°C)=50; cooler temperature (°C)=25, using the explicitly named quantities. Temperature difference equals warmer Celsius reading minus cooler Celsius reading. What result follows?
• Assessment case 4: Supplied case 4: warmer temperature (°C)=28; cooler temperature (°C)=16, using the explicitly named quantities. Temperature difference equals warmer Celsius reading minus cooler Celsius reading. What result follows?
• Assessment case 5: Supplied case 5: warmer temperature (°C)=60; cooler temperature (°C)=32, using the explicitly named quantities. Temperature difference equals warmer Celsius reading minus cooler Celsius reading. What result follows?
• Assessment case 6: Supplied case 6: warmer temperature (°C)=45; cooler temperature (°C)=21, using the explicitly named quantities. Temperature difference equals warmer Celsius reading minus cooler Celsius reading. What result follows?

Learn the idea

A difference compares two temperature readings in the same scale. A Celsius interval has the same size as a kelvin interval, but the zero points differ.

Temperature difference equals warmer Celsius reading minus cooler Celsius reading. The formula in the supplied model is a-b. Variable key: a = warmer temperature (°C), b = cooler temperature (°C). Use warmer minus cooler for a positive difference. A difference is not a total energy amount.

A distinct comparison is 30°C and 22°C: 30-22=8°C difference. Do not compare mixed temperature scales directly. Track the quantity and unit before calculating. Explain the meaning of a positive, negative or fractional result when relevant. A numerical answer supports the stated model calculation; broader claims require the additional measurements and assumptions described here.

1. Name the measured quantities and their units before substituting values.
2. Write the stated rule and use the variable key to match each symbol to its explicitly named quantity.
3. Calculate each supplied case separately, keeping intermediate arithmetic and the result unit.
4. Explain the result in context and identify the assumption that would invalidate direct use of the rule.

Check your reasoning

Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.

Take it further

Changed-input task: use the same stated model with warmer temperature (°C)=41; cooler temperature (°C)=20. Expected result: 21 °C. Explain what changes and keep this assumption: Do not compare mixed temperature scales directly.

Nothing here is saved to an account or sent to a teacher. The answer download includes your current choice and any checked feedback. It does not include choices from the separate More practice section. Download that section separately.