How will 2500 millilitres be written in liters?

Appeared in: RML PRE 2025

Explanation

The core principle of metric conversion between milliliters (mL) and liters (L) is that 1 liter equals 1000 milliliters.
To convert from a smaller unit (mL) to a larger unit (L), you must divide by the conversion factor.
The calculation is 2500 mL divided by 1000, which equals 2.5 L.
This option correctly expresses the total volume in the single requested unit of liters.

Option A: This option expresses the value in mixed units (liters and milliliters). While numerically equivalent to 2500 mL, it is not written purely in liters as the question implies.
Option B: This represents an incorrect conversion. 2 liters and 50 milliliters is equal to 2050 mL, not 2500 mL.
Option D: This option is nonsensical and does not represent a valid measurement. The 'and 100' part has no unit and is mathematically incorrect.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Metric unit conversion (milliliters to liters) as background academic context rather than a clinical decision trigger.
Accurate fluid conversion is a fundamental safety skill in nursing, essential for calculating IV drip rates, preparing medication dosages, and managing fluid balance charts.
An error in converting mL to L (or vice-versa) can lead to a tenfold or thousandfold dosing error, which can have severe or fatal consequences for the patient.
What if? If a nurse needed to administer 2.5 L of saline over 10 hours, they would first convert it to 2500 mL to calculate the hourly rate (2500 mL / 10 hr = 250 mL/hr). All calculations for infusion pumps are done in mL/hr.

How to Approach the Question

First, identify the question as a unit conversion problem within the metric system (milliliters to liters).
Recall the key conversion factor: 1 liter = 1000 milliliters.
Determine the correct mathematical operation. Since you are converting from a smaller unit (mL) to a larger unit (L), you need to divide.
Perform the calculation: 2500 ÷ 1000 = 2.5.
Evaluate the options to find the one that matches your calculated value and is presented in the correct format (a single unit of liters).
Eliminate distractors: one is in mixed units, one is a calculation error, and one is nonsensical.

Concept Tested & Keywords

QSqeHXfvog_3fOUj6Z4EL2

E6 Pharmacology Nurses Shanbhag 3e p. 52-54

E6 Nursing Fundamentals Taylor p. 848-850

E6 Nursing Vital Signs p. 115-117

Practise the full RML PRE 2025

Attempt every question from this paper in a timed mock, then review the full solution for each one.