Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
a pump in which
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "a pump in which" is correct and usable in written English.
It can be used to describe a specific type of pump and the context in which it operates or functions. Example: "The engineer designed a pump in which the fluid is circulated through a series of filters for purification."
✓ Grammatically correct
Science
News & Media
Encyclopedias
Alternative expressions(1)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
2 human-written examples
An axial flow pump is a pump in which the impeller (somewhat similar to a motorboat propeller) moves the fluid parallel to the pump shaft.
Science
Setting out to produce a pump in which "all of the details and materials were exactly to scale," Ms. Meckseper said that she and her New York-based studio began searching for a place in the United States with a high density of oil pumps that are still working.
News & Media
Human-verified similar examples from authoritative sources
Similar Expressions
58 human-written examples
A hospital took a second look at a device error with a syringe pump in which a dose of fentanyl was delivered in half the anticipated time.
A centrifugal pump is a rotodynamic pump in which the fluid is displaced radially by the impeller.
Science
The action of a diaphragm pump is similar to that of a piston pump in which the piston is replaced by a pulsating flexible diaphragm.
Encyclopedias
Considering the compressibility of the cavity in the cavitating flow, this paper presents a modified κ-ω model for predicting the cavitating flow in a centrifugal pump, in which the modified κ-ω model and Schnerr-Sauer cavitation model were combined with ANSYS CFX.
Amphibians breathe by means of buccal pumping, a pump action in which air is first drawn into the buccopharyngeal region through the nostrils.
Wiki
Collection of Hg from air was made using borosilicate glass columns packed with Au-coated glass beads attached to a battery-operated pump in which air was drawn through the Au trap at a rate of 2 L/min for 20 min.
One device of this type, useful for pumping both liquids and gases, is a two-bladed pump in which the rotor is eccentric to the stator, so forming a crescent-shaped volume that is swept by the blades through the outlet valve.
Encyclopedias
Moreover, channel members bear vestiges of pump behaviour, implying that the channels evolved from a pump member in which one of the gates failed.
Science & Research
Amphibians breathe by means of a pump action in which air is first drawn into the buccopharyngeal region through the nostrils.
Wiki
Expert writing Tips
Best practice
When describing complex systems, use "a pump in which" to clearly define the operating context or specific mechanism integral to its function.
Common error
Avoid using "where" when "in which" is more appropriate. "Where" generally refers to a physical location, while "in which" describes a condition or context within the pump's operation.
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "a pump in which" functions as a relative clause that modifies the noun 'pump'. It introduces additional information about the pump, specifying the context or mechanism involved. Ludwig AI confirms its correct usage in technical and descriptive writing.
Frequent in
Science
60%
Encyclopedias
20%
News & Media
10%
Less common in
Wiki
5%
Formal & Business
3%
Reference
2%
Ludwig's WRAP-UP
The phrase "a pump in which" serves as a specific descriptor to provide details on a pump's operational context or mechanism, as affirmed by Ludwig AI. It functions as a relative clause, frequently appearing in scientific, technical, and descriptive contexts. While grammatically correct, it's crucial to use "in which" appropriately, distinguishing it from "where" to ensure precision. For more formal writing, alternatives such as "a pump utilizing" or "a pump designed with" can be considered. This phrase is common across scientific literature, encyclopedias, and news media, emphasizing its broad applicability in technical discussions.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
a pump that
Changes the relative pronoun from "in which" to "that", simplifying the sentence structure.
a pump that has
Simplifies the structure to indicate possession of a certain attribute.
a pump with
Directly specifies an attribute or characteristic of the pump.
a pump where
Replaces "in which" with "where", focusing on the location or environment within the pump.
a pump utilizing
Uses "utilizing" to emphasize the pump's use of a particular method or technology.
a pump featuring
Emphasizes the specific characteristics or components of the pump.
a pump employing
Similar to "utilizing", but emphasizes the active use of something.
a pump designed with
Focuses on the design aspects of the pump and its specific features.
a pump operating by
Focuses on the operational mechanism or principle of the pump.
a pump constructed so that
Highlights the pump's construction to achieve a certain purpose or functionality.
FAQs
How can I use "a pump in which" in a sentence?
Use "a pump in which" to describe a pump with specific characteristics or operating conditions. For example, "This is an axial flow "a pump in which" the fluid moves parallel to the shaft."
What's the difference between "a pump in which" and "a pump that"?
"A pump in which" is typically used to describe a condition or mechanism within the pump, whereas "a pump that" is a more general descriptor. Using "a pump in which" adds specificity to the description.
Is it ever correct to use "a pump where" instead of "a pump in which"?
While grammatically acceptable in some contexts, "a pump where" is less precise. Use "a pump where" only when referring to a physical location within the pump. "A pump in which" is generally preferred.
Are there formal alternatives to using "a pump in which"?
Yes, you can use phrases like "a pump utilizing", "a pump featuring", or "a pump designed with" for more formal writing, depending on the specific attribute you're highlighting.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
81%
Authority and reliability
4.5/5
Expert rating
Real-world application tested