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Hydration in Food Tech

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Hydration in Food Tech

A local bakery is trialling a new bread roll. Your team must use evidence about dough hydration to recommend a recipe and a fair test. Answer every question; show working for calculations. Hydration is calculated as water mass ÷ flour mass × 100%.

Read the bakery trial notes

Three doughs were made with the same flour, yeast, salt, mixing time and proving conditions. Each used 500 g flour. The baker recorded how the dough felt and the baked roll’s average volume. Treat the figures as trial data, not universal results.

Water added

Dough observation

Average roll volume

300 g

Firm; easy to shape

105 mL

350 g

Soft; slightly sticky

132 mL

400 g

Very sticky; difficult to shape

126 mL

1.Calculate the hydration percentage for each dough in the trial. Show the calculation for one sample, then give all three percentages.

2.Which dough produced the largest average roll volume? Use the recorded result as evidence.

3.A new batch uses 600 g flour and is intended to have 75% hydration. How many grams of water are needed? Show your calculation.

Explain and interpret

Use the trial notes and your food technology knowledge. Remember: results from one trial do not prove that the same outcome will always occur.

4.Select the best explanation of why the 80% dough may have been harder to shape.

It contained more water relative to flour, making it stickier.
It contained less water relative to flour, making it drier.
Hydration percentage measures the oven temperature.

5.The 80% dough had more water than the 70% dough, but its recorded volume was lower. Give one reasonable explanation, using the observations or limits of the trial data.

6.Explain why hydration percentage is not the same thing as water activity (a_w). Include what hydration compares and what water activity indicates.

7.Choose two methods that can lower water activity and help preserve food.

Drying and adding salt or sugar
Adding extra free water and warming the food
Mixing for longer and using more flour

Plan a fair test

The bakery wants to check whether hydration affects roll volume. Design a test that could give more reliable evidence than a single bake.

8.Name the independent variable and the dependent variable for the investigation.

9.Give two conditions that should be kept the same so the comparison is fair.

10.Suggest a method for measuring roll volume consistently, and explain one way to improve reliability.

11.Write a recommendation to the bakery: choose 60%, 70% or 80% hydration for its next trial. Support your choice with one piece of trial evidence and mention one limitation.