What is the metric equivalent of 1 teaspoon in milliliters?

The metric equivalent of 1 teaspoon is 5 milliliters. This conversion is based on standard measurements used in cooking and medicine, where 1 teaspoon is defined as 5 milliliters in the metric system. Understanding this conversion is essential for accurately measuring medications, ingredients, or liquid substances in various fields, especially in healthcare, where precision is crucial for patient safety.

Other options represent common measurements but are not accurate conversions for 1 teaspoon. For example, 10, 15, and 20 milliliters correspond to different volumes and would lead to inaccuracies if substituted for the actual teaspoon measurement. Familiarity with this standard helps ensure proper dosing and measurements in medical and culinary practices.