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AQA GCSE · Question 06.6 · Homeostasis and Response
The control of body temperature is important in the human body. An athlete trained in a hot climate. On one day, the athlete lost 3200 cm³ of water in sweat. Evaporation of 1 cm³ of sweat requires 2.5 kJ of energy. Calculate the energy the athlete used for evaporation of sweat.
The control of body temperature is important in the human body. An athlete trained in a hot climate. On one day, the athlete lost 3200 cm³ of water in sweat. Evaporation of 1 cm³ of sweat requires 2.5 kJ of energy. Calculate the energy the athlete used for evaporation of sweat.
How to approach this question
1. Identify the total volume of sweat lost: 3200 cm³.
2. Identify the energy required to evaporate 1 cm³ of sweat: 2.5 kJ.
3. To find the total energy used, multiply the total volume of sweat by the energy required per cm³.
Full Answer
8000 kJ.
Working:
Energy = Volume of sweat × Energy per cm³
Energy = 3200 cm³ × 2.5 kJ/cm³ = 8000 kJ
The problem requires a simple multiplication to find the total energy used.
Total energy = (Volume of sweat) × (Energy needed per unit volume)
Total energy = 3200 cm³ × 2.5 kJ/cm³
Total energy = 8000 kJ
The athlete used 8000 kJ of energy for the evaporation of sweat.
Common mistakes
✗ Dividing the numbers instead of multiplying.
✗ Making a calculation error.
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