If lightning can destroy trees, how come that people survive it?

[jetwaterluffy]

I mean, trees are a lot bigger than people, aren't they?

 

[sophiecentaur]

Many people don't survive, of course!

I think it must be something to do with the difference in size and the resistivity of the structures. Trees explode because the water inside them boils rapidly and produces steam. This is because the produce of Volts and Current (defined by the overall length and the resistance) - the Power Dissipated - is high enough to boil the relatively small amount of water in the tree. (Less water implies a higher resistivity)
For an animal body, the volts are lower (it's a shorter structure and the voltage relates to the Field times the length) and the resistance is much lower (mostly water with dissolved salts). This suggests to me that there will be less actual Power involved; not enough to actually boil your insides.
There is also the 'skin effect' which determines the depth at which a pulse of current or and AC signal passes through a conductor. It stays just on the surface of a very good conductor. I think, therefore, that there will be more current flowing through the inside of a tree than of a human.

Otoh, plants don't have a delicate nervous system and, if they don't actually explode, they tend to stay alive and produce green shoots from some of the shattered stump. Animal hearts can just stop from the electric shock.

 

[Pkruse]

All that is true, but trees are not always destroyed. A hot strike will explode a tree as you say, but a cool strike will set it on fire. We can survive a very small current thru the heart, or sometimes a very large current. In the band in between we are dead. They have different theories as to why that is. Depending on the actual path the lightning takes, the actual current thru the heart can be high, low, or the fatal in between. In most cases of human strikes, the human is only a small part of the path as the air around us is ionized and becomes very conductive.

 

[Drakkith]

How often are people DIRECTLY struck by the main path of the lightning and not an "offshoot" path? Perhaps the difference is that trees commonly take the full brunt of the strike since they are taller and wider while people are usually only indirectly struck?

 

[sardar]

There are a few factors that contribute to why people are able to survive lightning strikes while trees may not. Firstly, humans are not grounded like trees are. Trees have deep roots that connect them to the ground and make them more susceptible to lightning strikes. On the other hand, humans are usually wearing shoes or standing on man-made surfaces that insulate them from the ground.

Additionally, humans have a smaller surface area compared to trees. Lightning tends to strike the tallest object in an area, and trees are often the tallest objects. This means that they are more likely to be struck by lightning compared to a person standing nearby.

Furthermore, humans have a complex network of nerves and muscles that help to dissipate the electric shock from a lightning strike. This, combined with our ability to seek shelter or take precautions when a storm is approaching, increases our chances of surviving a lightning strike.

Overall, while trees may seem like they would be better equipped to handle a lightning strike due to their size, there are several factors that make humans more likely to survive. However, it is important to always take precautions when a storm is approaching and avoid being outside during a lightning storm to minimize the risk of being struck.