Calcul de la masse d'eau dans des aliments

Calculating the Mass of Water in Breakfast Foods

This video explains how to calculate the mass of water contained in foods eaten at breakfast, using bread, butter, and milk as examples.

Ingredients and Quantities

• Bread: 50 g (30% water)
• Butter: 25 g (15% water)
• Milk: 250 g (85% water)

Method

1. Calculate Water Mass for Each Food Item Using Two Methods

Method 1: Percentage Formula

• Multiply the total mass by the water percentage (expressed as a decimal).

Examples:

• Bread: 50 g × (30/100) = 15 g water

• Butter: 25 g × (15/100) = 3.75 g water

• Milk: 250 g × (85/100) = 212.5 g water

Method 2: Rule of Three (Proportional Calculation)

• Consider the total mass as 100%.
• Calculate 1% by dividing the total mass by 100.
• Multiply the 1% mass by the water percentage.

Examples:

• Bread: 50 g ÷ 100 = 0.5 g (1%) 0.5 g × 30 = 15 g water

• The same steps applied for butter and milk yield identical results.

2. Calculate Total Water Mass Consumed

Add the water masses from each food item:

• Bread: 15 g
• Butter: 3.75 g
• Milk: 212.5 g

Total water mass = 15 + 3.75 + 212.5 = 231.25 g

Tips and Notes

• Both calculation methods yield the same results.
• The video demonstrates the practical use of percentages and proportional reasoning for nutritional calculations.

Equipment and Preparation

No cooking equipment or preparation is required; this is a nutritional calculation exercise.

Presenter/Channel

Not specified in subtitles.

Summary

The video teaches how to calculate water content in foods by applying percentage formulas and proportional methods, then sums these to find total water intake from a meal.