Meanings of leavening agent in English

But there is one great objection to the use of soda alone as a leavening agent.

Most recipes rely on baking soda and cream of tartar as the leavening agent for two reasons.

To appraise the quantity of the matter expectorated is beyond my powers: I observe the result, but do not perceive the leavening agent.

In an alkaline (low acid) batter, a teaspoon of baking powder is a more effective leavening agent than an equal amount of soda.

Explain the action of the leavening agents in Sour Milk Griddle Cakes (without eggs).

(5) Why are soda and sour milk and soda and molasses not accurate leavening agents?

The miners relied on the primitive leavening mostly because, unlike other leavening agents, it was easily renewed and maintained in the rugged frontier conditions.