How is 0.1 liter expressed in deciliters?

To express 0.1 liter in deciliters, it's essential to know the relationship between liters and deciliters. One liter is equal to 10 deciliters. Therefore, to convert liters to deciliters, you can multiply the number of liters by 10.

When you take 0.1 liters and multiply it by 10, you get 1 deciliter. This conversion factor is based on the metric system, where the prefix "deci" means one-tenth. Thus, a deciliter is one-tenth of a liter.

So, when you express 0.1 liters in deciliters, it equates to 1 deciliter, making this the correct answer.