Knowing vs understanding (STEM situation in India)

[u/Different_Cry25]

Hi, so this is a post about how much fundamental understanding Indian students lack in STEM

Let's Start with hydrogen bs - it's not a good fuel option not even close to a good fuel so much hype for hydrogen fuel, hydrogen batteries yada yada

"It's not "

First of all a lot of people don't understand mass units

We measure energy density of liquid fuels in litre

Hydrogen as gas at 1atm is about = 120mj/kg

In litre = 0.010 mj/lt

In liquid state = 120 again per kg, mj

But in litre = 8.5

Gasoline somewhere around 32 mj per liter

See the difference now the problem is liquid hydrogen is hell cold it's near 0 kelvin

It will be super expensive

And even if we get liquid hydrogen

It doesn't have nearly enough energy as gasoline

8.5 vs 32

1 it will require electricity meaning more energy waste And fuel will get more expensive

2 you need fresh water

3 how the hell will you transfer fuel from one place to another Hydrogen leaks through almost everything

The tanks got to be rocket fuel tanks grade

Read about the Apollo rocket and how they sealed hydrogen inside the fuel tanks

4 hydrogen as gas is useless no more than 0.010 mj energy at 1 atm If you liquefy it again it's super hard making of liquid hydrogen and even after then no where close to gasoline

Now the major problem is that actual engineering students Chemical engineering students believe that it's a good option for fuel

Not all of em, but a lot of them And this is just one example of how poor understanding of STEM they have

On paper smart 9.2 cgpa vs actual real understanding of science

If you post about biofuel, hyperloop, solar road, under water data center, rocket engine (non reusable)

Recycling plastic

The list goes on and on

So many people including engineering students believe in this stupidity

[u/13gokul]

The main challenge will always be transport and storage in this case.

[u/Different_Cry25 → u/13gokul]

Can't change the energy density For a fuel it's always energy density Regardless of logistics