Podcast
Play an AI-generated podcast conversation about this lesson
Questions and Answers
Which characteristic should topical powders have?
Which characteristic should topical powders have?
- Impalpable and free flowing (correct)
- Not adhere to the skin
- Large particle size
- Easily irritate the skin
What is the purpose of passing topical powders through a No. 100-mesh sieve?
What is the purpose of passing topical powders through a No. 100-mesh sieve?
- To increase particle size
- To decrease skin irritation (correct)
- To decrease particle size
- To increase skin irritation
Which of the following is a base or vehicle commonly used in topical powders?
Which of the following is a base or vehicle commonly used in topical powders?
- Calcium stearate
- Zinc stearate
- Cornstarch (correct)
- Magnesium stearate
What is the relationship between particle size and settling rate in powders?
What is the relationship between particle size and settling rate in powders?
Signup and view all the answers
What is the advantage of powders with small particle size?
What is the advantage of powders with small particle size?
Signup and view all the answers
Study Notes
Topical Powders
- Topical powders should have a uniform particle size to ensure uniform distribution and activity on the skin.
- Passing topical powders through a No. 100-mesh sieve ensures that the particles are of a uniform size, typically less than 150 μm.
- Talc is a common base or vehicle used in topical powders due to its absorbent and lubricant properties.
- Particle size affects the settling rate in powders, with smaller particles settling more slowly due to their lower density and greater surface area.
- Powders with small particle size have the advantage of increased surface area, which enhances their activity and effectiveness on the skin.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge of powders and their composition with this quiz! Learn about the properties of powders, including particle size and surface area. Discover how these factors affect the settling rate and appearance of powders.
