I would just like to say

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We had spud surprise t'other day. It included boil int bag white fish in butter source. The box tells yer to pop the bag before cookering int microwave. Eye has always done this but wondered iffit were necersary. So this time eye cookered it wiv no hole. Bad move. The bag expanded and split so it had its own hole near the bottom. This meant the source sprayed oot as the bowl turned round.
 
Hippo said:
We had spud surprise t'other day. It included boil int bag white fish in butter source. The box tells yer to pop the bag before cookering int microwave. Eye has always done this but wondered iffit were necersary. So this time eye cookered it wiv no hole. Bad move. The bag expanded and split so it had its own hole near the bottom. This meant the source sprayed oot as the bowl turned round.
Click to expand...
Isn't that why it's called "pop, plink, ping" or summat like that?
Boyle's law is why it happened 🤣 🤣 🤣 !
(Sorry about the sauce though!:()
 
'Ere ya go ----

Hippopuzzle.jpg
 
marjon said:
Took me years to get Boyles law, and temperature was never in the equation (P1 x V1) = (P2 x V2) that's it. init?

J
Click to expand...
That IS it but it assumes constant temperature.
If you heat a gas in a constant volume, the pressure of the gas inside it will rise in direct proportion to the temparature.
Which is why a piston in a car engine flies down (i.e. volume increases) when the mixture explodes. The volume increases as the temperature and therefore the pressure increases.
I believe the equation with all three in it is
P1V1/T1 = P2V2/T2
 
marjon said:
Took me years to get Boyles law, and temperature was never in the equation (P1 x V1) = (P2 x V2) that's it. init?

J
Click to expand...
I believe a lot of it is to do with Brownian Motion.

When you compress a gas, the temp rises all on its own, which is why diesel mixture eventually self-ignites.
There is also a "firestick" thing that works this way to light a fire.

Step 6: Firepiston​

Firepiston
Firepiston
How does it work?
Air gets very hot when it is compressed under high pressure. A classic example would be the heat that is created when one uses a bicycle pump. But when the air is compressed in a firepiston it is done so quickly and efficiently that it can reach a temperature in excess of 800 degrees Fahrenheit. This is hot enough to ignite the tinder that is placed in the end of the piston which has been hollowed out to accept it.

Ancient examples of the tube itself are of hardwood, bamboo, or even horn. It is closed on one end, very smooth inside and accurately bored. Equal care is taken in the creation of the associated piston. A "gasket" of wound thread, fiber, or sometimes leather insures a proper seal for successfully creating the compression. This gasket is "greased" to help with the seal and to allow free travel of the piston. The walls of the bore must be perfectly straight and polished smooth.
 
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