Question about pressure cooker "jiggler weights"

  • Context: Undergrad 
  • Thread starter Thread starter MaximRecoil
  • Start date Start date
  • Tags Tags
    cooker Pressure
Click For Summary

Discussion Overview

The discussion revolves around the operation of jiggler weights in pressure cookers, specifically focusing on the relationship between weight and pressure regulation. Participants explore the mechanics of how jiggler weights function, the implications of different weights on cooking times, and the confusion surrounding multiple weight markings on a single jiggler. The scope includes theoretical and practical aspects of pressure regulation in cooking.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • Some participants explain that pressure is related to force and area, suggesting a linear relationship between weight and pressure, where doubling the weight would double the pressure.
  • Others argue that the jiggler weight's effectiveness is influenced by the area of the vent tube, indicating that different diameters can result in different pressure settings despite the same weight.
  • A participant raises a question about why jiggler weights have multiple markings if the weight remains constant, suggesting that this could be misleading.
  • Some participants discuss the importance of distinguishing between gauge pressure and absolute pressure in the context of cooking temperatures and safety.
  • There is a mention of safety concerns regarding the use of jiggler weights without a safety valve, emphasizing the need for caution.
  • Several participants express confusion about how to relate the weight of the jiggler to the pressure it regulates, particularly in terms of the formula P=F/A.
  • One participant notes that the jiggler oscillates, which could affect the average pressure and temperature inside the cooker.
  • Another participant suggests that the jiggler's design could influence its operation, potentially leading to variations in performance.

Areas of Agreement / Disagreement

Participants express a mix of agreement and disagreement regarding the mechanics of jiggler weights, the implications of pressure regulation, and the clarity of the jiggler's design. There is no consensus on the effectiveness or accuracy of the multiple weight markings on jiggler weights.

Contextual Notes

Some participants highlight the need for clarity regarding the definitions of gauge and absolute pressure, as well as the specific areas of the jiggler that affect pressure regulation. There are unresolved questions about the relationship between jiggler weight and pressure, particularly in practical cooking scenarios.

Who May Find This Useful

This discussion may be useful for individuals interested in the mechanics of pressure cooking, those seeking to understand the implications of pressure regulation in cooking, and anyone curious about the design and functionality of jiggler weights.

  • #31
EXCELLENT ANSWER! I knew the answer, but you laid it out well. But can you help me with this? Can a similar thing be with cast iron Dutch ovens and using the weight of the lid being used in cooking under "x" pressure, and if in that process I used my red dot thermometer to monitor vessel temperature 220-250f? For example, the lid of mine is roughly 4.5lbs resting on a fairly nice uniform rim. And a thought was to use a leather weight bag or ankle weight, like in exercise items, to add a couple pounds to the lid to increase the pressure that leaks around the lid. I guess I'm looking at whatever dynamics in Dutch oven "pressure" to cook the concoction can be loosely equal to pressure cooker benefits in speed and doneness. A bit of MacGyver'ism. Mike
 
Physics news on Phys.org
  • #32
Mdjjjp37 said:
Can a similar thing be with cast iron Dutch ovens and using the weight of the lid being used in cooking under "x" pressure, and if in that process I used my red dot thermometer to monitor vessel temperature 220-250f?
The principle will be the same, but in practice it will be unworkable. The problem is the much greater surface area of the lid - because force equals pressure times area we will need either an unreasonably heavy lid or the pressure increase will be uninterestingly small.
 
  • Like
Likes   Reactions: berkeman, russ_watters, Mdjjjp37 and 1 other person
  • #33
Mdjjjp37 said:
Can a similar thing be with cast iron Dutch ovens and using the weight of the lid being used in cooking
Pressure vessels are always a safety concern. Cast iron is strong under compression but not very strong in tension. They don't make pressure cookers out of cast iron for this reason. They are designed carefully with the right materials.

If you want a pressure cooker then buy one of the right design. That way you can save yourself possible injury or the need to re-decorate your kitchen.
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K
  • · Replies 43 ·
2
Replies
43
Views
11K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 5 ·
Replies
5
Views
16K
Replies
2
Views
7K
  • · Replies 4 ·
Replies
4
Views
16K
  • · Replies 3 ·
Replies
3
Views
4K
  • · Replies 9 ·
Replies
9
Views
1K