Summer heat presents all types of hazards in regards to sensitive items and chemicals that don’t like extreme temperatures. In some scenarios, dangerous items have warnings posted on them because they may burst, explode, or have an otherwise unfavorable affect that can be harmful to people or surroundings. This is especially true when certain items are contained inside a car, where heat is even more prevalent because it can’t escape. Temperatures can rise to 140 degrees or more within an hour-and-a-half.

See why these 10 items are dangerous inside a car on a hot summer day and why it’s best to keep them out when temperatures get over 120-degrees.

1 – Lighters. Lighters are filled with flammable liquid. They aren’t meant to be exposed to extended sunlight or escalating temperatures. If they’re left inside a car on a hot summer day, they can explode and cause damage to the interior by leaving behind particles or burning holes.

2- Pens. These small objects can burst and leave ink all over the car. Cleanup can be a challenge, leaving stains everywhere.

3 – Batteries. Heat can make acid in batteries prone to leaking. If this happens, acid can cause people to have eye, skin, and respiratory infections.

4 – Electronics. Memory cards and lenses on cameras may get ruined if exposed to prolonged heat in a car during the summer. This can be costly for the owner.

5 – Canned carbonated beverage. This is a sneaky one that can be left in a car on a hot summer day without realizing it. This goes for beer as well. Cans can roll under a seat, hide in a trunk, or get lodged under a floor mat. If left inside the vehicle in blistering heat, a canned carbonated beverage can blow up. Since these canned items are compressed to keep air locked inside the container and maintain bubbles in the soda, there is no way for heat to escape.

The metal in the can conducts heat into the liquid inside. A rise in temperature on the outside of the container will also result in a rise of the liquid’s temperature inside. Liquid components expand as heat spikes and that causes undue pressure inside the canned beverage. The car’s motion will shake the soda around, leading it to explode. Not only can this do damage to your car, but it can inflict serious injury on the driver or passenger.

6 – Milk. A closed gallon or half-gallon of milk left exposed to the hot elements in a confined car will cause it to explode. This will leave a horrendous stench and mess that isn’t for the faint of heart.

7 – Wine. Wine shouldn’t be left in heat greater than 78-degrees because it not only changes the composition and complexity of the liquid, but a cork could pop out of it, or the bottle can explode.

8 – Perishable foods. While many of these may not explode, unlike milk, perishable foods should not be left inside a car over an hour in 90-degree heat, according to the USDA. Food can be dangerous to consume after that time.

9 – Hairspray and sunscreen. Women may carry a can of aerosol hairspray in their car, in addition to touch-up with makeup. While cosmetics may get sticky and melt, hairspray is a dangerous item to have inside a car. If temperatures reach above 120 degrees, the pressure inside the container will build-up and explode. It’s not just hairspray, but other aerosol canister products that will explode in a car (WD-40, Fix-A-Flat, etc.).

Sunscreen is useful to have in a car during the hot summer months, but the plastic bottle an quickly heat up and burst, leading to a sticky mess that may never be completely cleaned up.

10 – Explosive medications. Certain medications and supplies are dangerous inside a hot car. Albuterol inhalers, for instance, shouldn’t be in temperatures above 120 degrees or they may burst. Formoterol inhalers have the same impact. Any medication available in an aerosol can may burst as well under these temperatures.

The desert climate is unforgiving. If you’re stranded on a roadside or lost in the wilderness, you run the risk of heat stress or dehydration.

Without proper intervention, these conditions can cause serious health problems. Heat exhaustion can lead to heat stroke, which can damage the brain and other vital organs. In severe cases, heat stroke can be fatal.

Before you head out in the desert—even if you’re just planning on driving through—remember these tips to stay hydrated.

#1 – Pre-Hydrate. It is a good idea to drink plenty of water anytime you are planning to be in the desert (even if you’re just planning on driving through). Start drinking plenty of water the night before so you don’t start the day dehydrated. Remember—if you feel thirsty, you’re already dehydrated.

#2 – Pack Water. You do not want to find yourself stuck in the desert without water. Whether you’re planning on hiking, biking or you’re just driving through, pack plenty of water. It is recommended that you keep two gallons of water per person per day in your vehicle. If you’re hiking, you should carry at least a gallon of water for each day you plan to be out (although two gallons is safer).

#3 – Electrolytes. Hydration is important, but it’s also necessary to replenish the electrolytes that are lost through sweat. Pack salty snacks like pretzels or electrolyte powders you can put in your water.

#4 – Find Shade. The desert heat can be brutal. Conserve your energy and prevent heat stress by taking frequent breaks in the shade.

#5 – Identify Water Sources. Although the desert is hot and dry, you can find water sources if you know how to look for them. Talk to rangers or other knowledgeable folks about rainfall and watering holes before you head to the desert. Scan your surroundings and look for patches of green vegetation.

Cottonwoods and other trees need may indicate that a water source is present. The presence of animals and insects may also indicate that water is near. Use a water filter or another water purification system to treat the water before you drink it.

#6 – Soak Your Shirt. If you find a water source, you can soak your clothing in it to help you stay cool and prevent heat stress. Your clothes will dry quickly in the desert climate.

Surviving deadly desert heat isn’t easy, but with the right planning and practice it can be done. Know before you go, and you’ll get out alive.

The desert is an incredible environment to explore. Rock formations, vibrant colors, and varied landscapes make the hiking experience incredibly rewarding.

However, hiking in the desert comes with some serious risks. Even if you’re not planning to be gone for long, let someone know where you’re planning to hike and what time they should expect you to be back.

People who aren’t prepared to spend extended time in the desert frequently get in trouble due to dehydration, heat exhaustion, poor equipment, temperature fluctuations and flash flooding. These dangers can be easily avoided with preparation and awareness.

Around 80 percent of people who get lost are day hikers who aren’t prepared to spend more than a few hours in the wilderness.

If you find yourself lost, remember these seven priorities of survival.

1- Positive Mental Attitude: Maintaining a positive mental attitude is essential to survival. A clear mind will help you strategize a plan to keep you safe and help rescuers locate you. Your mental attitude will also help you conserve your energy so that you do not exhaust yourself by making poor choices.

2- Water: The desert is typically very hot and very dry. Because there are virtually no reliable water sources in the desert, you will need to pack at least a gallon of water per person for each day you plan to be hiking. Hydrate before you leave for the hike. Make sure you have iodine tablets or another method of purifying water so that you can safely drink water that you find.

3- Shelter: Temperatures can fluctuate dramatically in the desert. During the summer, temperatures can reach upwards of 115 degrees during the heat of the day. Wear long-sleeved clothing and a wide-brimmed hat to protect you from the sun. Carry an emergency blanket to provide a quick and effective shelter in case you get lost or injured.

4- Signaling: Always carry some sort of signaling device with you when you’re hiking. A whistle, signal mirror and brightly colored bandana can easily fit in a pack and can help rescuers locate you. If you’re in the backcountry, consider packing a satellite phone or personal locator beacon. You can use these devices to call for help in case of emergency.

5- Fire: The ability to make fire can save your life in case of an emergency. Fire provides an essential heat source to keep you warm when temperatures drop, and it also helps rescuers identify your location. Always pack fire starting tools and make you know how to use them before you hike.

6- First Aid Kit: The desert can bring many dangers. Make sure you have a first aid kit that is stocked with bandages, ointments, antiseptic wipes, allergy medications, painkillers and any other medications you may need.

7- Rest: If you are lost, you will need to conserve your energy. The desert sun is brutal. Avoid hiking in the heat of the day to reduce your risk of heat exhaustion and dehydration. Stay put and use your signaling devices to help increase the likelihood that you will be found.

If you are lost in the desert, these seven priorities of survival will help you stay calm and provide you with the tools you need to stay alive and get rescued.