Offbeat: Why Does Humidity Make Us Feel Hotter? - PressFrom - Canada
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OffbeatWhy Does Humidity Make Us Feel Hotter?

12:51  21 july  2019
12:51  21 july  2019 Source:   mentalfloss.com

Weather: Severe thunderstorm watch for the capital region

Weather: Severe thunderstorm watch for the capital region Weather: Severe thunderstorm watch for the capital region , with heavy weather possible later Saturday afternoon and evening. “Scattered thunderstorms are expected to develop and track southeastward along portions of the Ottawa Valley during the late afternoon and evening hours,” the agency says. “The storms may affect the National Capital area this evening.” Environment Canada cautions the storms could produce “wind gusts of 90 km/h, nickel sized hail, torrential downpours and frequent cloud to ground lightning.

Learn why a hot and humid day feels so dismal and some tips to avoid the really sweaty, gross days on today's Quick Question! What Makes Humidity Feel So Hot ? | We ’ve Watched This Droplet For 91 Years But Nobody’s Ever Seen it Happen - Продолжительность: 10:24 BE AMAZED 4 751

The humidity is to blame, but why does humidity make it feel hotter , or in the case of Woodward cooler?Sweat is the answer. Sweating is our body's way of cooling itself. Obviously when we get too hot we sweat, and the sweat evaporates off our skin.Evaporation is a cooling process

Why Does Humidity Make Us Feel Hotter?© Tomwang112/iStock via Getty Images What Exactly Is the Heat Index?

With temperatures spiking around the country, we thought it might be a good time to answer some questions about the heat index—and why humidity makes us feel hotter.

Why does humidity make us feel hotter?

To answer that question, we need to talk about getting sweaty.

As you probably remember from your high school biology class, one of the ways our bodies cool themselves is by sweating. The sweat then evaporates from our skin, and it carries heat away from the body as it leaves.

Humidity throws a wrench in that system of evaporative cooling, though. As relative humidity increases, the evaporation of sweat from our skin slows down. Instead, the sweat just drips off of us, which leaves us with all of the stinkiness and none of the cooling effect. Thus, when the humidity spikes, our bodies effectively lose a key tool that could normally be used to cool us down.

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It feels hotter with high humidity because you can’t sweat sufficiently enough to cool yourself. Sweating cools the body in dry heat when your perspiration evaporates , but when the air is very Why does it feel more hot than the actual temperature when it is very humid ? Because of the humidity .

This explains why it feels so much hotter in high humidity . When relative humidity reaches a high A metric called the heat index provides warnings for weather conditions that will make heat stroke Fabrics that do not wick moisture away from the skin, such as cotton, simply soak up the moisture and

What's relative about relative humidity?

We all know that humidity refers to the amount of water contained in the air. However, as the air’s temperature changes, so does the amount of water the air can hold. (Air can hold more water vapor as the temperature heats up.) Relative humidity compares the actual humidity to the maximum amount of water vapor the air can hold at any given temperature.

Whose idea was the heat index?

While the notion of humidity making days feel warmer is painfully apparent to anyone who has ever been outside on a soupy day, our current system owes a big debt to Robert G. Steadman, an academic textile researcher. In a 1979 research paper called, “An Assessment of Sultriness, Parts I and II,” Steadman laid out the basic factors that would affect how hot a person felt under a given set of conditions, and meteorologists soon used his work to derive a simplified formula for calculating heat index.

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Ever wondered why weather forecasters give you a " feels like" temperature? Humidity can change how hot you actually feel . Your body uses sweat to cool

I sometimes hear stories where people compare their feelings in winter in different places in the world. It goes like … or … so it implies that humidity somehow makes it feel colder.

Why Does Humidity Make Us Feel Hotter?© Provided by Sportority, Inc. (Mental Floss)

The formula is long and cumbersome, but luckily it can be transformed into easy-to-read charts. Today your local meteorologist just needs to know the air temperature and the relative humidity, and the chart will tell him or her the rest.

Is the heat index calculation the same for everyone?

Not quite, but it’s close. Steadman’s original research was founded on the idea of a “typical” person who was outdoors under a very precise set of conditions. Specifically, Steadman’s everyman was 5’7” tall, weighed 147 pounds, wore long pants and a short-sleeved shirt, and was walking at just over three miles per hour into a slight breeze in the shade. Any deviations from these conditions will affect how the heat/humidity combo feels to a certain person.

What difference does being in the shade make?

Quite a big one. All of the National Weather Service’s charts for calculating the heat index make the reasonable assumption that folks will look for shade when it’s oppressively hot and muggy out. Direct sunlight can add up to 15 degrees to the calculated heat index.

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Jerome H. Lemelson (1923–1997) USA – Inventions in the fields in which he patented make possible wholly or in part innovations like automated warehouses industrial robots cordless Gilles Saint-Hilaire (born 1948) Canada – Quasiturbine Qurbine. Watch Video: Why Does Humidity Make It Feel Hotter ?

In summer, air humidity has us feel hotter as there's less evaporation. In winter, it works to feel colder. Why is it opposite? Chris - So, on a cold day, if you've got air which has got a bit of water in it and it's cold, you got to supply a lot of energy to that wet air to make it get any hotter .

How does wind affect how dangerous the heat is?

Normally, when we think of wind on a hot day, we think of a nice, cooling breeze. That’s the normal state of affairs, but when the weather is really, really hot—think high-90s hot—a dry wind actually heats us up. When it’s that hot out, wind actually draws sweat away from our bodies before it can evaporate to help cool us down. Thanks to this effect, what might have been a cool breeze acts more like a convection oven.

When should I start worrying about high heat index readings?

The National Weather Service has a handy four-tiered system to tell you how dire the heat situation is. At the most severe level, when the heat index is over 130, that's classified as "Extreme Danger" and the risk of heat stroke is highly likely with continued exposure. Things get less scary as you move down the ladder, but even on "Danger" days, when the heat index ranges from 105 to 130, you probably don’t want to be outside. According to the service, that’s when prolonged exposure and/or physical activity make sunstroke, heat cramps, and heat exhaustion likely, while heat stroke is possible.

This article has been updated for 2019.

Heat warning in effect for Greater Montreal.
Environment Canada is asking people to check on older family, friends and neighbours to make sure they are cool and drinking water. READ MORE: Long-term care facility residents in Montreal suffer in extreme heat "Seek a cool place, such as a tree-shaded area, swimming pool, shower or bath, or air-conditioned spot like a public building," the agency said. "Outdoor workers should take regularly scheduled breaks in a cool place.

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