The short answer is that “hot air” just means regular air that is hot. But heat rises, meaning hot air is less dense than cold air, so it rises. When that hot air is pumped into the balloon’s canopy, it causes the balloon to rise. Helium on the other hand is a gas lighter than air (which is mostly nitrogen and oxygen).

Because helium is lighter than air, a helium balloon rises. Hydrogen is another gas lighter than air; it is even lighter than helium. Helium is a special gas called a Noble Gas, which means it doesn’t burn.

Helium is quite a lot lighter than air: it’s about an eighth of the density of air. Hydrogen is about a sixteenth the density of air, so it’ll float in air and will in fact float upwards.

Vegetable oil is just vegetable oil. It has no water. Acetone has no water. Ethanol has no water, yet these are all liquids.

Examples of water free drinks would be glacial acetic acid (really nasty, normal vinegar contains ~5% acetic acid, the rest is water, so imagine drinking pure acetic acid), olive oil (doesn’t mix with water, not very refreshing to drink) or diethyl ether (people used to “drink” this for its anesthetic properties, it …

The 7 Best Drinks for Dehydration

1. Water. As you can imagine, water is one of the best drinks to fight dehydration.
2. Electrolyte-Infused Water. What’s even better than water?
3. Pedialyte.
4. Gatorade.
5. Homemade Electrolyte-Rich Drink.
6. Watermelon.
7. Coconut Water.

1. Watermelon. Watermelon is very healthy and one of the most hydrating foods you can eat. A 1-cup (154-gram) serving contains over a half cup (118 ml) of water, in addition to some fiber and several important nutrients, including vitamin C, vitamin A and magnesium.

The researchers found that while water – both still and sparkling –does a pretty good job of quickly hydrating the body, beverages with a little bit of sugar, fat or protein do an even better job of keeping us hydrated for longer.

And like all parts of a healthy lifestyle, you need to make this a daily habit to keep your body hydrated.

1. Add some sparkle. Try seltzer or other bubbly water-based drinks.
2. Flavor it up.
3. Try a splash of 100 percent juice.
4. Turn to fruits and veggies.
5. Think about soup.
6. Tea or coffee count.
7. Dairy and milk-alternatives.

The 10 Healthier Beverages (besides water)

• Pomegranate Juice. Image: © Nitr/Fotolia.com.
• Low Fat Milk. Image: © Africa Studio/Fotolia.com.
• Green Tea. Image: © efired – Fotolia.com.
• Orange Juice. Image: © Brent Hofacker/Fotolia.com.
• Beet Juice. Image: © Printemps/Fotolia.com.
• Hot Chocolate.
• Kale Juice.
• Lemon Juice.

Check if you’re dehydrated Symptoms of dehydration in adults and children include: feeling thirsty. dark yellow and strong-smelling pee. feeling dizzy or lightheaded.

Signs of severe dehydration include:

• Not peeing or having very dark yellow pee.
• Very dry skin.
• Feeling dizzy.
• Rapid heartbeat.
• Rapid breathing.
• Sunken eyes.
• Sleepiness, lack of energy, confusion or irritability.
• Fainting.

If you’re worried about your or someone else’s hydration status, here are the 5 best ways to rehydrate quickly.

1. Water. While it likely comes as no surprise, drinking water is most often the best and cheapest way to stay hydrated and rehydrate.
2. Coffee and tea.
3. Skim and low fat milk.
4. 4. Fruits and vegetables.

For proper rehydration, it is advised that we do the opposite of chugging. According to Summit Medical Group, to correctly rehydrate your body we should sip water moderately, about two to three ounces at a time, throughout the day.