You can use "crisp" to describe many things. Food, weather, paper, people's personalities...
- I like to eat my cereal quickly, while it's still crisp. If it sits in milk too long, it gets soggy.
- It's finally fall! The air is crisp and cold.
- You can tell this book has been well-loved. Its pages are soft and curled, no longer crisp.
- Her attitude was crisp when I told her I was coming in late.
- Potato chips, lettuce, deep-fried foods, and maybe apples can be crispy.