1. What is Mass from Energy Calculator?

Definition: This calculator shows how energy can be converted to mass using Einstein's famous equation E=mc².

Purpose: It helps kids understand the relationship between energy and mass in a fun, interactive way.

2. How Does the Calculator Work?

The calculator uses Einstein's famous equation:

Where:

• \( m \) — Mass (kilograms, kg)
• \( E \) — Energy (Joules, J)
• \( c \) — Speed of light (3 × 10⁸ m/s)

Explanation: The equation shows that energy and mass are interchangeable - a small amount of mass can be converted to a huge amount of energy!

3. Why is This Important?

Details: This principle powers the sun (nuclear fusion) and atomic energy. It's one of the most important equations in physics!

4. Using the Calculator

Tips: Enter the energy in Joules and the speed of light (default 300,000,000 m/s). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the speed of light squared in the equation?
A: The c² shows that a tiny bit of mass contains HUGE amounts of energy because light speed is so large and we square it!

Q2: How much energy is in 1 kg of mass?
A: About 90,000,000,000,000,000 Joules - that's the energy in a small atomic bomb!

Q3: Can we really turn energy into mass?
A: Yes! Particle accelerators do this all the time, creating particles from energy.

Q4: Why don't we see this in everyday life?
A: The effects are too small to notice unless dealing with nuclear reactions or very fast particles.

Q5: What's a Joule in everyday terms?
A: About the energy needed to lift a small apple 1 meter up - not much, but c² is HUGE!