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  2. Pulse tube refrigerator - Wikipedia

    en.wikipedia.org/wiki/Pulse_tube_refrigerator

    The disadvantage of the linear PTR is that the cold spot is in the middle of the cooler. For many applications it is preferable that the cooling is produced at the end of the cooler. By bending the PTR we get a U-shaped cooler. Both hot ends can be mounted on the flange of the vacuum chamber at room temperature. This is the most common shape of ...

  3. Dilution refrigerator - Wikipedia

    en.wikipedia.org/wiki/Dilution_refrigerator

    The heat necessary for the dilution is the useful cooling power of the refrigerator, as the process of moving the 3 He through the phase boundary is endothermic and removes heat from the mixing chamber environment. The 3 He then leaves the mixing chamber in the dilute phase. On the dilute side and in the still the 3 He flows through superfluid ...

  4. Manual vacuum cleaner - Wikipedia

    en.wikipedia.org/wiki/Manual_vacuum_cleaner

    Manual vacuum cleaner. The manual vacuum cleaner was a type of non-electric vacuum cleaner, using suction to remove dirt from carpets, being powered by human muscle, similar in use to a manual lawn mower. Its invention is dated to the second half of the 19th century, when patents were granted to inventors in the United States, Britain, France ...

  5. The 5 best cordless vacuums for 2024 - Engadget

    www.engadget.com/best-cordless-vacuum-130007125.html

    The Shark is a solid vacuum with a self-emptying base,in the same price range. But the Pure One S15 Pet has stronger suction and did a better job cleaning up big messes. It’s also worth noting ...

  6. Vacuum cleaner - Wikipedia

    en.wikipedia.org/wiki/Vacuum_cleaner

    A vacuum cleaner, also known simply as a vacuum, is a device that uses suction, and often agitation, in order to remove dirt and other debris from carpets and hard floors. The dirt is collected into a dust bag or a plastic bin. Vacuum cleaners, which are used in homes as well as in commercial settings, exist in a variety of sizes and types ...

  7. Playdate revisited: Two years with the little yellow ...

    www.engadget.com/playdate-revisited-two-years...

    Senior Editor. Fri, Apr 12, 2024 · 7 min read. Playdate came out two years ago, and it’s still miniscule and yellow with a black-and-white screen and a delightful crank on its side. Today, the ...

  8. Refrigerator - Wikipedia

    en.wikipedia.org/wiki/Refrigerator

    Globally. Food in a refrigerator with its door open. A refrigerator, commonly fridge, is a commercial and home appliance consisting of a thermally insulated compartment and a heat pump (mechanical, electronic or chemical) that transfers heat from its inside to its external environment so that its inside is cooled to a temperature below the room ...

  9. The best robot vacuums on a budget for 2024 - Engadget

    www.engadget.com/best-budget-robot-vacuums...

    Roborock has made many improvements to its fleet of robot vacuums in recent years and the Roborock Q5 is a good, basic option that you can often find it on sale for between $200 and $300. There ...

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