Question

When can we use bernoulli equation for pressure cooker?

Answer 1

Bernoulli's principle is a seemingly counterintuitive statement about how the speed of a fluid relates to the pressure of the fluid. Many people feel like Bernoulli's principle shouldn't be correct, but this might be due to a misunderstanding about what Bernoulli's principle actually says. Bernoulli's principle states the following,

Bernoulli's principle: Within a horizontal flow of fluid, points of higher fluid speed will have less pressure than points of slower fluid speed.

It doesn't have to be horizontal, but the change in height of the fluid during flow cannot change too drastically, otherwise changes in gravitational potential energy will become important and potentially render Bernoulli's principle inaccurate.

Bernoulli's principle can be made more general if you take gravitational potential energy into account. The result of which is called Bernoulli's equation (which we will derive later in this article).

So within a horizontal water pipe that changes diameter, regions where the water is moving fast will be under less pressure than regions where the water is moving slow. This sounds counterintuitive to many people since people associate high speeds with high pressures. But, we'll show in the next section that this is really just another way of saying that water will speed up if there's more pressure behind it than in front of it. In the section below we'll derive Bernoulli's principle, show more precisely what it says, and hopefully make it seem a little less mysterious.

Answer 2

Answer:

⇒Bernoulli's principle is a seemingly counterintuitive statement about how the speed of a fluid relates to the pressure of the fluid. Many people feel like Bernoulli's principle shouldn't be correct, but this might be due to a misunderstanding about what Bernoulli's principle actually says. Bernoulli's principle states the following,

⇒Bernoulli's principle: Within a horizontal flow of fluid, points of higher fluid speed will have less pressure than points of slower fluid speed.

⇒It doesn't have to be horizontal, but the change in height of the fluid during flow cannot change too drastically, otherwise changes in gravitational potential energy will become important and potentially render Bernoulli's principle inaccurate.

⇒Bernoulli's principle can be made more general if you take gravitational potential energy into account. The result of which is called Bernoulli's equation (which we will derive later in this article).

Explanation: