Physics. - 2021-07-31

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Jack Rod

3:25 PM

@JohnRennie hi

John Rennie

@JackRod Hi :-)

Jack Rod

Sir are u free at the moment?

John Rennie

Yes :-)

Jack Rod

I have one question related to ocean salinity?

John Rennie

That isn't something I know anything about, but I'll help if I can.

Jack Rod

3:27 PM

sir what is the basic difference between the salt in a lake and the salt in ocean?

do the process in between them is different?

@JohnRennie

John Rennie

Do you mean why doesn't lake water have much salt in it?

Jack Rod

Some what yes.

John Rennie

Well lake (and river) water comes from rain, and rain was produced by evaporating water from the sea and condensing it back to water to fall as rain.

And when you evaporate water it leaves all the solutes behind. The rain is basically distilled water.

That's why river water has no salt, and lakes are mostly filled by rivers so they have no salt either.

Jack Rod

Sir, I think I was failed to elaborate my question lake mean salt lake not normal river,

so difference between salt in river vs salt in lake

how those ions work to form salt and the process starts

John Rennie

Ah, they are both just sodium chloride.

The rain dissolves salt out of the ground, and rivers carry that salt into lakes and ultimately into the sea.

In most lakes rivers flow into the lake then out of the lake again, so the lake remains with a low salt level.

Jack Rod

3:37 PM

actually sir how an isolated salt lake is formed which has no connection with sea

John Rennie

Once the salt gets to the sea it has nowhere to go, so the sea gets gradually saltier and saltier.

This happens with lakes as well if there is no way for the water to flow out of the lake. Rivers carry water into the lake, along with a small amount of salt, but if the only way for water to leave the lake is by evaporation then the salt builds up in the lake just like it does in the sea.

Jack Rod

@JohnRennie thanks sir

John Rennie

Are there salt lakes in Rajasthan?

Jack Rod

@JohnRennie yes!

my mom home town didwana

John Rennie

I didn't know that! I'll have to Google it.

Jack Rod

3:41 PM

unique lake

and sambhar as well big salt lake near jaipur

@JohnRennie I head about charity is it kind of organz you run?

John Rennie

truerajasthan.com/didwana-lake

Cool :-)

Yes, I set it up in memory of my father.

Jack Rod

you never told!!

John Rennie

If I told everyone i would be bombarded with requests :-)

Jack Rod

great work sir even I started teaching poor kids around my home

charity begins at home!!

John Rennie

:-)

Jack Rod

3:46 PM

@JohnRennie then sir how u identify right candidate?

I mean there many u do not even know who u talking to real or fake!

John Rennie

It's not that had. We don't give money, only educational stuff that isn't of interest to people who aren't doing the JEE and it's only small things - not anything very expensive.

Jack Rod

even that is great u are sitting in uk

you know sir recently i travelled to my grandma town

John Rennie

It's all good karma :-)

@JackRod Where does she live? In Rajasthan?

Jack Rod

yes

John Rennie

What town?

Jack Rod

3:49 PM

not far

jaislmer

John Rennie

I guess the covid restrictions have been eased a bit then? If you're allowed to visit relatives in different towns.

Jaisalmer

Jaisalmer pronunciation , nicknamed "The Golden city", is a city in the Indian state of Rajasthan, located 575 kilometres (357 mi) west of the state capital Jaipur. The town stands on a ridge of yellowish sandstone and is crowned by the ancient Jaisalmer Fort. This fort contains a royal palace and several ornate Jain temples. Many of the houses and temples of both the fort and of the town below are built of finely sculptured sandstone. The town lies in the heart of the Thar Desert (the Great Indian Desert) and has a population, including the residents of the fort, of about 78,000. It is the...

The Golden City!! :-)

Jack Rod

@JohnRennie yes pretty sir your charity make me remembered a guy who was genuine math guy not good in English but a math genius in lockdown his study affected him most

he do not know chem and physics at all.

neither jee

John Rennie

Is he going to do the JEE?

Jack Rod

idk whether he knows about jee at all, all he know is he want to get into a math degree but he does not have anything no smartphone no laptop

I gave him a advice to prepare for it and explained what jee is

I had some saving related to my phone that i gave him and by that we bought a new smart phone for him

John Rennie

Wow, that's great :-)

Jack Rod

3:56 PM