1. What is Mass?

Mass is a fundamental property of matter that measures the amount of substance in an object. It remains constant regardless of location, unlike weight which changes with gravity. Mass is typically measured in kilograms (kg).

2. How to Calculate Mass from Weight

The relationship between mass and weight is given by:

Where:

• \( Weight \) — Force due to gravity (in Newtons, N)
• \( g \) — Acceleration due to gravity (9.81 m/s² on Earth)

3. How to Calculate Mass from Volume

Mass can also be calculated from volume and density:

Where:

• \( Volume \) — Space occupied by the object (in m³)
• \( Density \) — Mass per unit volume (in kg/m³)

4. Using the Calculator

Tips: Select calculation type (from weight or from volume). For weight calculation, enter weight in Newtons and gravity value. For volume calculation, enter volume in cubic meters and density in kg/m³.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between mass and weight?
A: Mass is the amount of matter in an object (constant), while weight is the force exerted by gravity on that mass (varies with location).

Q2: Why is g = 9.81 m/s²?
A: This is the average acceleration due to gravity at Earth's surface. It varies slightly by location (9.78-9.83 m/s²).

Q3: When should I use volume calculation instead of weight?
A: Use volume calculation when you know the material's density and can measure its volume, especially for irregular objects.

Q4: How accurate is this calculator?
A: Accuracy depends on input precision. For scientific work, use measured local gravity and precise density values.

Q5: Can I use this in space?
A: Weight calculation won't work in microgravity (g ≈ 0), but volume calculation remains valid if you know density.