1. Fun with E = mc2

2. E = mc2 is everywhere!

3. What do you think of… Knowing = Memorising ≠ Using
Energy (in joules)
= Mass (in kilograms) X
The Speed of Light Squared
(in meters squared per second squared) ?
Complex Science?!?
But did you know these units?
No…
Because you never used E = mc2 !!!
for us…
Knowing = Memorising
Its our same old friend E = mc2
≠ Using

4. So lets use it…
How much energy will one litre of water yield if it is converted entirely into Energy?

5. Isn’t that a strange question?
E = mc2 tells you exactly how much energy a given amount of mass contains.
Use it Properly!
Lots of energy goes into making even a small mass and it can also be got back in some form.
Neither can be destroyed but, under special circumstances, either can be turned into the other
No it’s Not!
Matter and Energy are two forms of the same thing!

6. The speed of light…
Light travels three hundred million meters in a second i.e. 300,000,000 m/s
A meter is as big as a ???
So (forgetting the units for now)
Energy = mass x (300,000,000)2
or E = m (90,000,000,000,000,000)
= m (9 x 1016)
(this form is easier to use isn’t it?) .
That’s a
BIG
lot

7. Mass m = 1 What is the mass of 1 litre of water? So, E = 1 (9 X 1016)
A litre of water is defined to have a mass of
one kilogram!
m = 1
So, E = 1 (9 X 1016)
= 9 X 1016 Joules
That is it!
Was that tough?

8. What else can you find out about?
Free your Mind!
What could all this energy
be used to power?

9. Energy & Power
A Joule is the effort required to push one kilogram over a meter at an acceleration of one meter/second2.
A Joule expended continuously for one second is a Watt.
A litre of water, converted to energy
could power a 1 watt light bulb for…
9x1016 seconds, or 2.5x1013 hours
or ~3 billion years! (2/3 the age of the Earth)
Show One Joule

10. Best use… All our energy comes from the Sun!
The Sun has E=mc2 as its source of energy.

11. Nuclear Fusion
When 4 hydrogen nuclei are fused together into 1 helium nucleus, energy is released in the form of Light photons and particles called neutrinos. 

12. But where does the mass come from?
Mass of 4 hydrogen nuclei is more than that of 1 helium nucleus
So after fusion a little bit of mass is left over. This mass deficit appears as the energy of light and neutrinos.

13. A look inside… The fusion happens 700,000 km deep in the Sun’s core.
It needs unbelievable temperatures of 15 million degrees.

14. The Sun emits 4 x 1026 joules per second
More E = mc2
The Sun emits 4 x 1026 joules per second
How much mass does it convert each second in order to shine?
If the Lifetime of the Sun
is 1010 years, how much mass would it need in that time?
Use m = E/c2 !

15. What Einstein didn’t tell us…
How do you convert any mass to Energy?
Scientists are trying to make a sun on the Earth. A fusion reactor that uses hydrogen.
Hydrogen is the simplest & lightest element.
Hydrogen is abundantly found in water!
Hydrogen fusion has been tried and tested in Nature and on Earth (in H-Bombs).