Physical Chemistry of Foods

time scale of observation what we observe or, more precisely, on the
Deborah number:

De:

relaxation time

observation time

ð 5 : 14 Þ

Note This dimensionless ratio is named after the Old Testament

prophetess Deborah, who said ‘‘the mountains flow before the

Lord’’; Judges 5:5.

FIGURE5.10 Stress relaxation. (a) Strain applied to a material as a function of

timet. (b) Resulting stresssfor various materials;t¼relaxation time.