Question

why does a thin wooden stick burn easily whereas a thick log of wood does not catch fire easily?

Answer 1

a thin wooden stick have less ignition temperature whereas thick log have high ignition temperature

Answer 2

A thin wooden stick have less ignition temperature whereas thick log have high ignition temperature.

The minimum temperature at which a substance starts to burn is called its ignition temperature.

Different fuels have different ignition temperatures.

Some fuels have low ignition temperature and some have high ignition temperature.

The fuels that have low ignition temperature are highly inflammable and burn quickly at the spark of fire.

While some fuels that have high ignition temperature do not burn quickly.

They require heating to burn.

For example kerosene oil does not burn unless it is heated up to its ignition temperature.