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More ways to get Braingle...

Ketchup Sachet

Science brain teasers require understanding of the physical or biological world and the laws that govern it.

 

Puzzle ID:#39364
Fun:*** (2.86)
Difficulty:** (1.93)
Category:Science
Submitted By:King_of_Smart*

 

 

 



A man picked up a plastic water bottle and filled it to the rim with water. He put a ketchup sachet in it and closed it up.

The man approached a woman and said, "If you can solve how this works, I'll give you a dollar."

The man said "down" and the sachet of ketchup suddenly went down. Then he said "up" and it went up. Then he said "down", and when it was halfway down, he said "stay" and it stayed.

How did he do this?


Hint

Think pressure.
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Comments

snappytom*au*
Nov 25, 2007

Fun!
jsdodgersAus*
Nov 25, 2007

ive done the same thing just using a straw and paper clip. Good teaser though
lukeschettAus*
Nov 25, 2007

Is a sachet like a packet?
newbie885Aus*
Nov 26, 2007

that was very clever
onua9159Aus*
Nov 26, 2007

Very clever and cool trick. I didn't think hard enough to get it the first time I read it.
snipatcn
Nov 26, 2007

reeal ez
i guessed and got right
snipatcn
Nov 26, 2007

snipatcn
Nov 26, 2007

a sachet is like the things you rip and squeeze the ketchup lol
tick*us*
Nov 29, 2007

Very interesting, I will post again after I try this with my children, ages 5 & 12. Should be very fun for them, lol! Thanks!
rockstar1234567Aca*
Jan 29, 2008

you didn't even say how you add pressure
(user deleted)
Mar 18, 2009

You add pressure by squeezing the plastic bottle.
(Remember it is closed up tight so you can use pressure on it)
TableElbowsA*
Aug 19, 2009

I thought squeezing too
rob77*ca*
Mar 07, 2011

How about saying "up", then lifting the bottle, saying "down" and lowering it...the ketchup would go up and down
xdbtcpAus*
Mar 07, 2011

So...did she get the $1?
morlolet*
Mar 07, 2011

amazing!!!!!!!!!
math321Aus*
Mar 07, 2011

I was thinking that he moved the ketchup by tilting the bottle. Though in hindsight that wouldn't explain how he tried to astound the woman he bet a dollar with.
Babe*
Mar 08, 2014

That was very easy! The cheap skate only offered a dollar?
cutebugAus*
Mar 08, 2014

Love Babe's answer.
catmom*us*
Mar 08, 2014

A dollar? Would have to do better than that. My time is valuable after all.
funkman48
Mar 08, 2014

The explanation is no explanation. This is a variation on the Cartesian Diver. The air in the packet (sachet) is compressed upon squeezing, and the bouyancy of the packet is lessened so it sinks. Practice allows you to squeeze the bottle with enough force to allow the packet to float in the middle. It's all about Boyle's law of pressure and volume.
funkman48
Mar 08, 2014

buoyancy



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