It depends on what the powder is. Teaspoon is a measure of volume; ounces are a measure of weight. For example, ten ounces of sand have less volume than ten ounces of flour.

ANSWER 0.7 ounce equals 4.199081 US teaspoon and 4.140294 UK teaspoon That's not what the question was, it was .07, not .7, so you have to divide your answer by 10.