Another basic physics question.

[donkpow]

Let's say you want to clean out your 32 oz. lemonade bottle but you don't want to get out the bottle brush to do the job. So you put some dish soap in there with some hot tap water, cap it off, and shake it around for a while. Now you take the lid off and there is escaping air from the bottle. Why is the bottle pressurized? There is no outside influence to speak of and the water is not carbonated, etc.

[Razors Edge ★]

1 minute ago, donkpow said:

Let's say you want to clean out your 32 oz. lemonade bottle but you don't want to get out the bottle brush to do the job. So you put some dish soap in there with some hot tap water, cap it off, and shake it around for a while. Now you take the lid off and there is escaping air from the bottle. Why is the bottle pressurized? There is no outside influence to speak of and the water is not carbonated, etc.

Heat. You shook it. That was an energy transfer.

[Further]

When the dish soap foams up it changed state and released gas

[bikeman564™]

The water temperature is warming the air inside the container, which increases pressure.  The air inside the bottle is room temp, until the water heats it up.

[Square Wheels]

'cause

[maddmaxx ★]

You eat dish soap, you fart.

[jsharr ★]

Charles would be the Ideal person to ask about this.

[Parr8hed]

1 hour ago, Further said:

When the dish soap foams up it changed state and released gas

I do that myself from time to time. 

[KrAzY]

Warm water let’s the Molecules move at a faster rate, the soap acts as a finding agent with the H2O. With shaking the container you are now transferring more heat and moving the molecules more rapidly. 

[12string]

8 minutes ago, KrAzY said:

Warm water let’s the Molecules move at a faster rate, the soap acts as a finding agent with the H2O. With shaking the container you are now transferring more heat and moving the molecules more rapidly. 

I think you're making that up.  If it did that AND what Razor said, the bottle would have exploded.  

[donkpow]

21 minutes ago, 12string said:

I think you're making that up.  If it did that AND what Razor said, the bottle would have exploded.  

I think they are all making things up. This is the last time I ask a serious question around here.

[KrAzY]

2 hours ago, 12string said:

I think you're making that up.  If it did that AND what Razor said, the bottle would have exploded.  

Not true. The bottle needs to be highly compressed by a substance off gassing to crest an explosion. There is not a chemical reaction taking place.

[Parsnip Totin Jack ★]

2 hours ago, maddmaxx said:

You eat dish soap, you fart bubbles.

FIFY

[MickinMD ★]

On 4/21/2022 at 11:29 AM, donkpow said:

Let's say you want to clean out your 32 oz. lemonade bottle but you don't want to get out the bottle brush to do the job. So you put some dish soap in there with some hot tap water, cap it off, and shake it around for a while. Now you take the lid off and there is escaping air from the bottle. Why is the bottle pressurized? There is no outside influence to speak of and the water is not carbonated, etc.

The air in the bottle was not hot to begin with, but shaking the bottle transferred heat from the water to the air.

The expansion of air is proportional to the absolute temperature, where 0 = -460F.  So if the air temperature inside the bottle is raised from 70F to 90F, the air would want to expand ((90+460)/(70+460) - 1) x 100% = 4%.

That desire to expand by 4% - or a smaller but positive percentage if the air isn't heated as much - means the air pressure in the bottle is 4% higher than the air pressure in the room, so the air inside of the bottle escapes to the outside when the lid is opened.

[Ralphie ★]

On 4/21/2022 at 12:31 PM, Square Wheels said:

'cause

Mark as solution!  Also, Joan as Policewoman.  Has to be one of the catchiest band games out there!

[Ralphie ★]

On 4/21/2022 at 1:00 PM, jsharr said:

Charles would be the Ideal person to ask about this.

I was think Peter Boyle. 

[donkpow]

2 hours ago, MickinMD said:

The air in the bottle was not hot to begin with, but shaking the bottle transferred heat from the water to the air.

The expansion of air is proportional to the absolute temperature, where 0 = -460F.  So if the air temperature inside the bottle is raised from 70F to 90F, the air would want to expand ((90+460)/(70+460) - 1) x 100% = 4%.

That desire to expand by 4% - or a smaller but positive percentage if the air isn't heated as much - means the air pressure in the bottle is 4% higher than the air pressure in the room, so the air inside of the bottle escapes to the outside when the lid is opened.

That's what I thought.

[2Far ★]

8 hours ago, MickinMD said:

The air in the bottle was not hot to begin with, but shaking the bottle transferred heat from the water to the air.

The expansion of air is proportional to the absolute temperature, where 0 = -460F.  So if the air temperature inside the bottle is raised from 70F to 90F, the air would want to expand ((90+460)/(70+460) - 1) x 100% = 4%.

That desire to expand by 4% - or a smaller but positive percentage if the air isn't heated as much - means the air pressure in the bottle is 4% higher than the air pressure in the room, so the air inside of the bottle escapes to the outside when the lid is opened.

Jeez, Mick, PV=nRT and let him do the work himself.