Pascal Law Apparatus, Weinholds Type
Product Code : EL-POM-10370
Quick answer: The Weinhold-type Pascal's law apparatus shows that liquid pressure at the base of a vessel depends only on the depth of liquid, not on the vessel's shape. Glass vases of different shapes with equal bottom openings fit the base in turn, and a pivoted lever with pressure disc and counterpoise pan detects the pressure. Lab Exports manufactures it in Delhi for schools, colleges and universities.
Specifications
| Item | Specification |
|---|---|
| Base | With a hole at the bottom to which each vase is attached |
| Vases | Set of glass vases of different shapes and sizes, with identical bottom openings |
| Index pointer | Vertically adjustable, to mark the liquid level in each vase |
| Lever arm | Pivoted, with pressure disc and counterpoise pan |
| Principle shown | Liquid pressure depends on depth, not on vessel shape or size |
How the Pascal's vases experiment is done
The pressure at the bottom of a liquid column is p = rho g h, and the force on the base opening is that pressure multiplied by the area of the opening. Every vase has the same bottom opening, so when each is filled to the same depth the force on the pressure disc is the same, even though a wide vase holds far more water than a narrow one. This result, often called the hydrostatic paradox, is what the apparatus is built to show.
- Fit the first vase to the hole in the base, so that the pressure disc on the lever arm closes the opening.
- Load the counterpoise pan and set the index pointer at a chosen height.
- Pour water slowly into the vase until the water pressure just forces the disc away from the opening and water starts to escape; note the level against the pointer.
- Change to a vase of a different shape, keep the same counterpoise load and fill again.
- Observe that the disc gives way at the same level each time.
Narrow and wide vases alike release the disc at the same depth, so the pressure on the base depends on depth and density alone, not on the weight of liquid in the vessel.
Key features
- Set of glass vases in different shapes and sizes with identical bottom openings
- Pivoted lever arm carrying the pressure disc
- Counterpoise pan to set the force the liquid must overcome
- Vertically adjustable index pointer to mark the liquid level for each vase
- Single bottom hole in the base, so every vase is tested in the same position
Documentation and supply
Installation instructions and a manual are supplied with the apparatus. Most Lab Exports products carry a one-year manufacturer warranty.
Lab Exports manufactures the Pascal's law apparatus at its works in Laxmi Nagar, Delhi, and supplies it to schools, colleges and universities in India and 60+ countries, handling the export documents for each shipment. More about the company is on the About Lab Exports page.
Related Properties of Matter products
- Bernoulli Tube Apparatus (EL-POM-10369)
- Liquid Level Apparatus (EL-POM-10371)
- Simple Pascal Law Experiment (Pressure String) (EL-POM-10368)
- Expansion of Liquid Apparatus (EL-POM-10372)
- Fluid Pressure Apparatus (Spouting Cylinder) (EL-POM-10367)
- Charles Law Apparatus (Combined) (EL-POM-10373)
The full range is in the Properties of Matter section of the Physics Lab range.
Frequently asked questions
What does the Pascal's law apparatus, Weinhold type, demonstrate?
It demonstrates that liquid pressure at the base of a vessel depends on the depth of liquid and not on the shape or size of the vessel.
What is the counterpoise pan for?
It loads the lever so that the pressure disc holds against the liquid until the pressure at the base reaches a set value.
Why do all the vases have the same bottom opening?
With equal openings, equal pressure gives equal force on the disc, so vases of any shape can be compared fairly.
What is the price of the Pascal's law apparatus?
Prices are not published on the website. Add the Pascal's law apparatus to the Enquiry Cart with the Add To Cart button on this page, or email [email protected] with the house code EL-POM-10370 and the quantity, to receive a quotation.
Does Lab Exports manufacture the Pascal's law apparatus?
Yes. Lab Exports manufactures the Pascal's law apparatus at its works at 11/315, Lalita Park, Laxmi Nagar, Delhi 110092, under house code EL-POM-10370.
Request a quote
Email [email protected] with the house code EL-POM-10370 and the quantity, or add the Pascal's law apparatus to the Enquiry Cart with the Add To Cart button on this page. Tender buyers can also see the Tenders and OEM page.
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