Cyril Takayama -- Teaches Magic

the trick is simple. The package contains ketchup and air. The average density of the package is lower than the density of water, making it floats (called archimedes principal). As you squeeze the bottle, the density of liquid (both water and ketchup) is almost unchanged, but the density of the air is increased very significantly by the higher pressure (just look up the gas law). So the average density of the package is increased to be higher than the density of water, as it sinks.

the trick is simple. The package contains ketchup and air. The average density of the package is lower than the density of water, making it floats (called archimedes principal). As you squeeze the bottle, the density of liquid (both water and ketchup) is almost unchanged, but the density of the air is increased very significantly by the higher pressure (just look up the gas law). So the average density of the package is increased to be higher than the density of water, as it sinks.

that isn't a real trick, nearly everyone knows how to do that

i'm finishing high school... but i study science my own cause i like it... i'm going to study architecture. ^^

no offense buddy
by study science you mean you're still in middle school right?
I learned about that in highschool
like what lordkaramazov said
it's a submarine bottle

he's fluent in english...

Cyril actually can speak english and japanese, unfortunatly he gets most of his t.v. specials in japan, so most of these videos on youtube are in japanese.

crazy japaneze we cant even understand his language he cant speak english.

that is what i was waiting for... a real logical comment... you're right, pressure is the answer ^^... thnx

yea maybe, but not everyone knows about some things like this.

actually it is squeezing the bottle. You're right that water density can't change, but this isn't about water density. it's about pressure. There are some things that float or sink at certain pressure levels. You can thnk of it this way (keyword: THINK OF IT THIS WAY): squeezing the bottle near the bottom increases pressure towards the top. since the cover is closed, the pressure has no where to go so it comes back down, which pushes the ketchup pack down.

...and even though it says all that, my ketchup seems to like sinking better XD

Do please(pretty please?) don't flame me for my previous comment, I'm not a science girl. I'm just translating what I hear.

God people, stop the flame war. Here's the translation: "After the ketchup is in, push the bottle with your thumb, the pressure in the ketchup is lightened, so without the floating power it starts to sink. Meanwhile, u make the viewer distracted by moving ur index finger and pretending u're using ur command power to make it move" So by doing that or slightly removing that pressure from the bottle, you can make the viewers believe not only you can move it freely, but you can also to make it stop.

OMG And u say u study science and that it isnt the bottle squeeze....havent u ever heard of the "submarine": bottle, water, plasticine and a open pen cap?? its the bottle squeeze...i guarentee u...i dont know the proper english terms for it, but its all pressure and buoyancy(i googled it for proper terms).
fluid physics explain this, and he just squeezes the bottle.

no! you can't do that squeezing the bottle! i study science... it's all about density... bt you can't change waer density squeezing the bottle. i thing he changes the density of the thing he introduces in the bottle somehow... i don't how... maybe chemistry reaction inside. magic is all logic, maths and science... but they do it so well we can't discover how it's done.