THE CRUMB INSTITUTE
HYDRATION 70.0 % DOUGH TEMPERATURE 24.1 °C BENCH REST 41 min
[NOTICE: THE BENCH WAS CHECKED FOR LEVEL AT 08:00 AND WAS LEVEL] — FLOUR STORE HELD AT 14.2 °C AND 51 % RELATIVE HUMIDITY — VESSEL PLACED AND TARED TO ZERO — 350.0 g OF WATER ADMITTED AT 21.4 °C IN A SINGLE CONTINUOUS POUR — SALT WEIGHED SEPARATELY AS SPECIFIED, 9.0 g — THE STIRRING WAS JUDGED TOO FAST AND WAS SLOWED — THE OVEN TIMER IS SET TO 38 MINUTES AND NOT TO 79 MINUTES — [NOTICE: THE BENCH WAS CHECKED FOR LEVEL AT 08:00 AND WAS LEVEL] — FLOUR STORE HELD AT 14.2 °C AND 51 % RELATIVE HUMIDITY — VESSEL PLACED AND TARED TO ZERO — 350.0 g OF WATER ADMITTED AT 21.4 °C IN A SINGLE CONTINUOUS POUR — SALT WEIGHED SEPARATELY AS SPECIFIED, 9.0 g — THE STIRRING WAS JUDGED TOO FAST AND WAS SLOWED — THE OVEN TIMER IS SET TO 38 MINUTES AND NOT TO 79 MINUTES —
CBI-2025-119 · published

On the pouring of batter

Abstract

Batter was poured from a fixed height through a funnel of known geometry and the time required to empty it was recorded to the nearest half second. The pour time is a usable proxy for apparent viscosity and requires no instrument beyond a funnel and a person willing to hold it. We report pour times for three flours, two resting intervals and one accidental over-mix.

apparent viscosity: μ = τw / γ̇ pour time as proxy: t ∝ μ / ( ρ g d ) resting 0 min t = 6.5 s (n = 8) resting 15 min t = 4.8 s (n = 8) resting 30 min t = 4.6 s (n = 8) → no further change beyond 15 min

Method

Funnel clamped at 200 mm above the bench. Batter at 20 °C. The funnel was rinsed between pours and shaken twice, a step that adds roughly 0.2 s and that we have not been able to remove.

Result

Resting the batter for fifteen minutes reduces the pour time by a quarter. Resting it for thirty minutes does not reduce it further, and resting it for ninety minutes produces a pancake that is noticeably different and that the keepers have declined to characterise statistically.

Limitations

Pour time depends on the funnel. The funnel was dropped in week three and replaced with a funnel of nominally identical geometry that gave pour times 0.4 s longer. Both funnels are reported.

Pour time, unrested
6.5 s
Funnel at 200 mm, batter at 20 °C, eight pours.
Pour time, rested 15 min
4.8 s
A quarter faster. Further resting changes nothing.
Funnels
2
The second is 0.4 s slower and nominally identical.
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