Convert as indicated, 18 L to milliliters \( 18 \mathrm{~L}=\square \mathrm{ml} \) (Type an integer or a decimal.)

To convert liters to milliliters, simply remember that 1 liter is equal to 1,000 milliliters. So to convert 18 liters to milliliters, you multiply by 1,000: \( 18 \, \text{L} = 18 \times 1,000 \, \text{ml} = 18,000 \, \text{ml} \). So, \( 18 \text{ L} = 18,000 \text{ ml} \). Now, for a fun fact: Did you know that the liter is a metric unit that was originally defined as the volume of one kilogram of pure water at 4 degrees Celsius? Talk about precision in measurement! And speaking of conversions, if you're frequently switching between units, consider keeping a handy conversion chart nearby or using a conversion app. It saves time and prevents those pesky calculation errors!