It's important to ensure other people can't easily unlock your phone—especially if you store private photos in the standard “Hidden” folder in the Photos app. You can add a passcode to protect it—just go to Settings > Face ID and Passcode (or Settings > Touch ID and Passcode, on older devices and iPad).
Metric cup & spoon sizes*cupmetric1/3 cup80ml1/2 cup125ml1 cup250ml
500mlThere are 1000 milliliters (ml) in 1 Liter. So 250ml is equivalent to one quarter of a Liter. And 500ml is equivalent to half a Liter.