The cooling curves of chicken curry, milk (full fat, semiskimmed,
skimmed and soya), Indian tea and water in a
saucepan are illustrated in Fig. 5. These products had similar
initial temperatures but the chicken korma and tikka masala
curries retained heat for longer and took more than twice the
time of water, milk and Indian tea to reach 53 8C (Table 1). Full
fat and semi-skimmed milk cooled at a slightly slower rate
than skimmed and soya milk.
Takeaway beverages (Americano, cappuccino, latte and
soya latte) that were served in cardboard cups had lower
temperatures at the start (ranging from 67 8C to 85 8C) but cooled at a substantially slower rate than the liquids prepared
in the kitchen and poured into porcelain mugs (shown in Fig. 6
and Table 1). Americano coffee was hotter and retained heat
for longer than the takeaway coffees served with milk.
Sunflower cooking oil was heated in a saucepan to 300 8C
and took 53 min to reach 53 8C. Residual boiled water in a
kettle followed by coffee in an insulated mug cooled at the
slowest rate of all the liquids tested (Table 1).