How Does It Add Up

When people think about E = MC2, they tend to focus on the energy side of the equation, how much energy a tiny winy amount of mass would unleashed. But here we will try to look at it from the mass side of the equation.


Let’s take a 20 year male, his height is 180 cm (5” 11’) and weight 98 kilograms (216 pounds). More than 20 years ago, this male didn’t exist.

In physics term, his weight of 98 kilograms, 21 years ago didn’t exist.

Now, we have a mass, that 21 years ago didn’t exist. The mass is not 98 kilograms, mind you, 98 kilograms is the weight of the man on Earth, which has a gravity constant of 9.8. To add to the caveat, the actual measurement of weight is actually Newton, not Kilogram.

The amount of this mass is 98 Newtons divided by 9.8 N/Kg, which is 10 Kilogram.

Since this male didn’t exist 21 years ago, his mass of 10 Kg also didn’t exist 21 years ago.

Think about it, 21 years ago, nothing; today, a 10 Kg of mass. 

In the span of 20 years, this mass of 10 Kg has been created. According to Einstein equation, for this male to exist, his mother and his body need to gather energy of 10 x 300,000,000 x 300,000,000 = 9 x 1017 Joules. That’s nine hundred thousand trillion Joules.

How much is 1 Joule?

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Science, model, fact

i got the following exposition from

Now, the link is to an archive that is full of rant and some interesting thoughts on the various building blocks of how we describe science

The exposition has a lot of abstractions, questions the way you define things, and thus, is a very good brain practice, i enjoy it, i hope u feel the same

since the internet is everchanging, i like to maintain a version of the exposition here in my blog, so i can revisit it again

Let’s hear more of this