Buoyancy: What Goes Up Must Come Down to Density
A hot-air-balloon ride is a magical experience, but it works because of the same principle that makes ice float. Strap in as Groupon explores the basics of buoyancy.
The Greek philosopher Archimedes is famous for coining the term, "Eureka!" in his bathtub when he noticed that the water level rose as he lowered himself in. Among his other revelations, Archimedes discovered the following principle: an object immersed in a fluid experiences an upward force equal to the weight of the liquid it displaces. This concept is known as buoyancy, and it explains why, for example, an ice cube floats in a glass of water. Ice is less dense than water, but it still displaces the same volume of water as its own volume (another Archimedes principle). Thanks to buoyancy, the upward force is equal to the weight of the displaced water, not the ice, and the lighter cube ends up floating.
The same principle explains why a massive hot-air balloon floats as effortlessly as an astronaut evading his chores. As the air inside the balloon is heated, it expands and becomes less dense—each cubic foot of 300-degree air, for instance, weighs about half an ounce less than the same volume of colder air. According to Archimedes, the object (balloon) immersed in a gas (the sky) experiences an upward force equal to the weight of the gas it displaces (the outside air). So as long as the lift generated by the hot air is greater than the balloon, its basket, and its passengers combined, it lifts off into the sky. To bring the vessel back to earth, the pilot simply lets the hot air escape through a vent, increasing the density of the air inside and tipping buoyancy's scales back toward gravity.
Visible Difference Skin Care & Day Spa isn't just a mom-and-pop salon. Oh, no, they've got services on services on services. With a full hair and spa salon, you'll finally feel like a brand new you.
Soften, brighten, and nourish your skin with a rejuvenating facial from this salon.
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Keep your circulation flowing and your muscles eased with a massage from this salon.
If you're seeking a top-of-the-line dentistry that includes services such as teeth whitening, look no further than Visible Difference Skin Care & Day Spa.
More often than not, customers try more than just one of the many beauty services at Visible Difference Skin Care & Day Spa. Some of their best are eyelash extensions, as well as many more!
These full service tanning salons will help your skin look brighter and bolder. tanning beds and airbrush tan are just some places to start.
Keep up with the latest and greatest hair trends at this salon, a highly-rated and fashion-forward establishment.
Smooth and healthy skin starts with Visible Difference Skin Care & Day Spa's hair removal services.
This salon in El Cajon can only accommodate guests with pre-scheduled appointments.
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At Visible Difference Skin Care & Day Spa, you have the option of paying by major credit card.
Guests of Visible Difference Skin Care & Day Spa's North Westwind Drive location can park their vehicles on the street.
Relax away your problems at Visible Difference Skin Care & Day Spa where any bad day is easily resolved.
Switch up your go-to haircut and color and leave Giovanni's Hair Nails and Skin in El Cajon feeling like a brand new person.
Recapture a healthy and glowing complexion with a facial from this salon.
To instantly hydrate and moisturize your skin, treat yourself to a skin care treatment from Giovanni's Hair Nails and Skin.
Those kinks aren't just going to disappear on their own. A massage can really help and lucky for you, this salon offers relaxing treatments.
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Stop waiting for service when you take advantage of the excellent walk-in service at this salon.
Luxurious comforts may come at a cost, but Giovanni's Hair Nails and Skin keeps that cost down so everyone can enjoy their services.
Giovanni's Hair Nails and Skin also accepts credit card payments for those who prefer to pay with plastic.
Giovanni's Hair Nails and Skin is conveniently close to a parking lot.
Get the hairstyle you've been dreaming of with the help of the expert stylists at Giovanni's Hair Nails and Skin.
Looking for a great place to get your Zen on? Check out the selection of day spa services at Le Prince Salon and Day Spa in El Cajon.
Keep your skin looking young and wrinkle free with a facial from this spa.
If you're looking to clear up your skin, a skin treatment from Le Prince Salon and Day Spa is exactly what you need.
Take advantage of a signature nail treatment, such as pedicures and manicures, and leave with some sassy nails.
The stylists at this spa are trained in a wide variety of hair care services, including cut and color processes.
Enjoy a relaxing massage at this spa and remove the stress that has been building up.
For your convenience, this beauty establishment also accepts walk-ins for services and treatments.
Pamper yourself with moderately-priced spa services from this establishment and keep your wallet in check.
Le Prince Salon and Day Spa welcomes your beauty appointments to the 21st-century. Pay with any major credit card, no cash needed!
With a parking lot adjacent to Le Prince Salon and Day Spa, you won't get stuck circling the block.
So when split ends get you down or your roots begin to show, schedule an appointment at Le Prince Salon and Day Spa today.
The decor at W Salon and Spa—curled chandeliers, furniture upholstered with monochrome prints, and antique-looking wooden bureaus at each styling station—evokes an Enlightenment-era salon steeped in serenity. The literary setting is appropriate since the staff views the venue as a sanctum for the self, where guests can sink into relaxed introspection. With a team that specializes in a number of fields, the spa addresses a sweeping spectrum of services to facilitate such pampered meditation.
A licensed cosmetologist primps complexions with makeup applications and eyelash extensions, and a certified massage therapist calls upon five modalities to put physiques at ease more effectively than a soothing impression of Morgan Freeman narrating a documentary about sloths. Hair- and skincare treatments benefit from Unite and Sonya Dakar products, respectively.
On the spa's medical side, technicians combat wrinkles with Botox injections and curtail unwanted hair growth with carefully aimed laser treatments. The beauticians also host spa parties, accommodating wedding groups and celebrations for expectant mothers as well as birthdays.
What services does your business offer and what makes your business stand out from the competition?
Located in the Heart on El Cajon on Main Street we are conveniently located with a fun and relaxing environment you will feel right at home.
What was the inspiration to start or run this business?
I have always been fascinated by the beauty industry. Helping people feel to feel their best has been a passion of mine since I was a young girl.
What do you love most about your job?
Being able to help people to feel better about themselves, whether its helping someone get their acne under control, helping to diminish fine lines and wrinkles or giving their skin a healthy glow, along with educating the clients with some tips for at home to benefit the skin inbetween services.
What is the best reaction you've ever gotten from a customer?
Tears of joy from one of my returning customer's because she could start to see the difference in her acne after just one ttreatment. And all the referrals I recieve