A dry leavening agent (used to incorporate air or  cause rising, usually in breads and baked goods) made from a mixture of a weak acid and either  carbonate or bicarbonate.

The first baking powder to contain bicarbonate  of soda and acid was invented by Alfred Bird in 1843.

Baking powder is used all over the world for baking.

The first ever baking powder was “pear ash” or potassium carbonate made from wood ash.

“The Great Uprising: How a Powder Revolutionized Baking” by Ben Panko (2017) www.smithsonianmag.com/science-nature/great-uprising-how-powder-revolutionized-baking-180963772

“The Science of Baking Soda.” By Alice Graves and Kate Qualmann (2018)