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Questions tagged [water]

A chemical substance with the chemical formula H₂O, and an important biological solvent.

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41
votes
1answer
4k views

Is refilling water bottles bad for you?

On a lot of bottles of so called mineral water, it is advised not to refill the bottle (with ordinary tap water, or any other drink e.g. cola) as doing so may present a health hazard. Is there any ...
21
votes
1answer
4k views

Does Masaru Emoto's experiment show human consciousness affects the aesthetics of water crystals?

Japanese author and doctor of alternative medicine, Masaru Emoto claims that water can react to intentions. Talk nice to water and you get nice looking ice crystals from it. Mention Adolf Hitler near ...
224
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4answers
27k views

Does hot water freeze faster than cold water?

Is it true that hot water freezes faster than cold water and if so, what practical applications have there been found for this phenomenon?
20
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2answers
15k views

Is drinking hot water more beneficial during hot weather?

I heard from various sources since I was growing up that during hot weather one should drink warm or hot drinks and during cold weather one should rather drink cold drinks, but a quick google found no ...
28
votes
2answers
2k views

Does dowsing (aka Water Divining) work?

Also known as water divining, the more general term is dowsing. Practitioners claim to be able to detect minerals and even specific objects. I first became interested in dowsing in my teens, when the ...
41
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3answers
3k views

Can microwaved water explode?

Some time ago I read a warning that microwaved water can "explode" under certain circumstances. There was one case as an example where someone heated water in the microwave, took it out and then it "...
23
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2answers
3k views

Do fruit/vegetable washes effectively remove pesticides?

Is there any evidence to suggest that commercially available fruit/vegetable washes can effectively remove pesticides from produce? Here are some example claims: Veggie Wash uses natural cleaners ...
38
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3answers
4k views

Is water fluoridation harmful?

There’s a controversy going around whether the benefits of water fluoridation outweigh the potential harms. What is the evidence for the harm this may cause and what evidence supports the health ...
24
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2answers
12k views

Has 99% of the western continental Europe banned water fluoridation?

I keep seeing this claim about the unpopularity of water fluoridation parroted. Despite dental pressure, 99% of western continental Europe has rejected, banned, or stopped fluoridation due to ...
19
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2answers
1k views

Does hydraulic fracking endanger the drinking water supply?

According to an industry website the process of Hydraulic Fracturing (or "fracking") is safe. According to an article in the Huffington Post the process is not safe. At least, there is evidence the ...
81
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2answers
12k views

Is drinking water during a meal bad for you?

I have heard that it will "wash away the nutrients", that it dilutes stomach acid and all kinds of things. Is this just an old-wives tale?
50
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2answers
4k views

Do people need to drink 8 glasses of water a day?

Since I was a kid, I can't remember how many times I've heard that a healthy person needs to drink at least 8 glasses of water a day. There are definitely plenty of reasons to remain well-hydrated. ...
19
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2answers
12k views

Does drinking warm or hot water aid in digestion?

One of my brother-in-law's coworkers claims that drinking hot water (straight from the tap) aids in digestion. I've been able to find a debunking of cold water causing cancer, but can't find anything ...
24
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1answer
19k views

Is it dangerous to mix boiled and unboiled water?

There is a popular belief in Russia that mixing boiled and unboiled water (say, adding cold unboiled water to a cup of tea to cool it) can be dangerous for one's health, even if it is safe to drink ...
21
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2answers
12k views

Is water calcification bad for your health?

I have a friend, who adamantly believes that water calcification causes a number of problems, including poor health. He also said it made the water taste disgusting. He had recently installed a ...
12
votes
1answer
6k views

Does drinking coffee or tea dehydrate you?

It is widely claimed that despite being made mostly of water, drinking coffee or tea will actually dehydrate you, because the caffeine is a a diuretic. Here is an example from the SFGate news site ...
37
votes
2answers
9k views

Does drinking distilled water remove needed minerals from your body?

Claim: Drinking distilled water can actually remove needed minerals from the body, due the lack of minerals in the water, and therefore do damage to the body. I have a hard time accepting this due ...
36
votes
1answer
12k views

Is it beneficial to drink alkaline water (aka Kangen water)?

At a friend's house the other day, some sort of contraption had appeared near the sink since the last time I had been there. It was a filtration-looking device with one input hose connected to the tap ...
40
votes
2answers
56k views

Is there a place in the world where two oceans meet and they don't mix?

This picture is currently being spread virally: Some Muslims were saying that this is mentioned in the Quran where it is said: He has set free the two seas meeting together. There is a barrier ...
16
votes
2answers
12k views

Does Indian Water Therapy have healing effects?

Indian Water Therapy is an ancient practice which involves drinking 1-1.5 litres of water every day as soon as you wake up, then not eating anything until 40 minutes has passed, at which point you can ...
53
votes
4answers
12k views

Does water swirl the opposite way on the other hemisphere?

I have heard this one several times but was never given a convincing explanation. Is this a real phenomenon? (Bonus points for a good physical description of the behavior or reasons it couldn't occur....
25
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1answer
14k views

If you put your hand in water while sleeping/drunk, will you pee yourself?

This is like an urban myth and a classic prank, but I never saw it in action. Supposedly if someone is passed out or sleeping, the contact with water will make him pee. Is this true? If true, why ...
55
votes
1answer
50k views

Do laws exist that say restaurants must serve customers who request tap water?

My mother claimed the other day that it is a "state law" that any restaurant must serve customers tap water upon request, therefore not requiring customers to buy a (flavored) drink or (overpriced) ...
44
votes
3answers
25k views

Is watering plants under a hot sun bad?

A couple of people have told me that it's a bad for plants to be watered in the middle of a sunny day, i.e. it's not just that you waste more water due to evaporation, but that there are actually bad ...
25
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1answer
2k views

Can anything be 'more hydrating than water'?

Some sports drinks, and even vegetables claim to be 'more hydrating than water'. What does this even mean? How is 'hydration' even measured? If I ate enough cucumbers could I survive without ever ...
16
votes
3answers
6k views

Is there any reason to use cold water over hot water for boiling?

I was always told that boiling cold water in a pot is better for you then boiling warm or hot water (from the sink). Is there any truth to this statement?
14
votes
1answer
633 views

Do excreted oral contraceptive compounds in drinking water contribute to male infertility?

I've run across several claims about oral contraceptives ("the pill") and how the residuals that enter municipal water supplies via urination cannot be filtered out and may have detrimental effects on ...
12
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2answers
1k views

Does increasing water intake during a diet help with weight loss?

Just about any weight loss coach/program I've ever seen say that drinking a lot of water (exact amount vary) combined with a low-calorie diet helps with losing weight (compered to the diet alone) ...
30
votes
1answer
37k views

Did the Nazis maliciously fluoridate drinking water?

Firstly, I think this is a stupid unbelievable question. However, for the sake of getting on S.SE, is there any evidence to for the Nazis using fluoride maliciously for example, to make prisoners more ...
13
votes
4answers
14k views

Is there hard science behind the benefits of home water softeners? [closed]

Does anyone know of any empirical studies or well-tested scientific theories on the benefits (or lack thereof) of using a home water softener? I have a water softener in my house that we installed ...
9
votes
1answer
709 views

Can an on-the-fly water electrolyzer linked to the air intake improve fuel efficiency of a gasoline engine?

This article initially seems to investigate so-called water powered cars. The final few paragraphs of the article however branches off into discussion about a system where (as I understand it): A car'...
7
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2answers
4k views

Does drinking cold water help to reduce weight?

According to this article, it was mentioned: there may be advantages in drinking cold water for weight loss So, does drinking cold water really help to reduce weight? and does drinking warm water ...
34
votes
2answers
40k views

Do magnetic water softeners work?

I'm extremely skeptical of the idea of magnetic water softeners (strong magnets attached to pipes), but desperately wish it were true because I hate lugging 40# bags of salt out to my well house in ...
16
votes
1answer
2k views

Does it take 200L of water to make a latte?

I just saw this Youtube clip that claims it takes 200L of water to make a latte. Is that true?
16
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3answers
3k views

Can an electronic device reduce scale buildup in waterworks?

I have recently received an ad for a device attaching to my inlet water pipe and a power socket, and claiming to massively reduce the scale build-up. This compact, computerised limescale remover ...
15
votes
1answer
25k views

Are there any benefits to drinking 1.5 liters of water first thing in the morning (water therapy)?

I'm not sure the origin of this "water therapy", but I've seen various websites that claim that drinking 1.5 liters of water right when you wake up is great for your body/mind, heals all diseases, etc....
7
votes
1answer
23k views

Do the water filters in Bobble water bottles work?

A retailer claims that Bobble water bottles: Filter your own bottled water with this unique and patented set of two Bobble Water Bottles. An active carbon filter eliminates toxins and harmful ...
5
votes
1answer
2k views

Does drinking water (or Sports Drink) improve performance during sports activities?

I have been looking for some concrete study about the performance changes during sports when drinking water or a sports drink while doing the sport. Not after, not before. While, or during, if you ...
3
votes
1answer
480 views

Does salt (or sodium) not make you thirsty?

This is from a Toronto MS thesis: High dietary sodium intake is hypothesized to increase food intake (FI), fluid intake and glycemic response. Two short-term randomized repeated-measures studies ...
2
votes
0answers
278 views

Is it actually beneficial to reduce water consumption? [closed]

Household appliances are getting more and more efficient at conserving water, and advertising claims that this helps conserve the environment. Some time ago, I've seen a documentary about a German ...