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Hydrofluoric acid, a solution of hydrogen fluoride gas (HF) in water, is one of the most corrosive and dangerous chemicals encountered in the laboratory. Exposure to HF can cause severe tissue damage and even death. The fluoride ions in HF readily bind calcium and magnesium, reducing their levels in the blood, resulting in hypotension and cardiac effects.1 Deaths have been reported from concentrated acid burns (involving ≥ 50% HF solutions) to as little as 2.5% of body surface area, which is equivalent to approximately one hand and forearm.2 In lower concentrations, symptoms may be delayed, which can lead to delayed recognition of exposure and a more severe burn. The following special safety precautions are necessary when using this chemical, regardless if using dilute or concentrated HF.

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USA TODAY is exploring the questions you and others ask every day. From "Is manifestation real?" to "What are angel numbers?" to "What is my birthstone?" − we're striving to find answers to the most common questions you ask every day. Head to our Just Curious section to see what else we can answer.

"They are careful, slow and strategic," she wrote. "People like being around them because they bring a calm and collected energy to those who need it."

Hydrofluoric acid (HF) exposure is very toxic and can be fatal if not treated immediately. HF is absorbed quickly; however, damage/symptoms can occur hours to days later. Any person exposed to HF must have immediate first aid, followed by immediate medical treatment from a physician. When seeking medical attention bring a copy of this HF Fact Sheet, the Safety Data Sheet (SDS) for the product used, and the Honeywell guide, “Recommended Medical Treatment for Hydrofluoric Acid Exposure” to the Stanford Hospital Emergency Room.

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Immediately call EH&S at (650) 725-9999 (286 from School of Medicine phones) to report an HF spill that is health threatening, is outside of the fume hood, is greater than 30 mls, or will take longer than 15 minutes to clean up. Do not use spill kits with kitty litter or sand because HF reacts with silica to produce silicon tetrafluoride, a toxic gas.

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Air signs tend to be intelligent and are seen as dreamers with their heads eternally in the clouds. "Air is the element that connects us to the intellect and anything that involves thinking, writing or speaking," Montúfar wrote.

It is common for an air sign to pursue a career as a journalist or writer, spurred by their desire to process everything and to see situations from different angles.

Fire signs bring the heat and won't shy away from initiating things. They can also be impulsive and need to be reminded to pace themselves.

The 12 Zodiac signs are split into four elements: fire, water, earth and air. Each element houses three signs, outlining additional characteristics that define those born under them. The elements work in tandem with your birth chart to provide further context and nuance to your astrological profile.

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"Fire is by far the most energetic element," astrologer Narayana Montúfar previously shared in an email to USA TODAY. She describes fire signs as "enthusiastic, sexy, exciting, and fun to be around."

There's a lot more to astrology than someone's primary Zodiac sign. Beyond your "sun sign," there are other intricacies that can help determine your personality, disposition and approach to relationships.

"Water is the strongest of elements in the natural world," Montúfar wrote. Because of this, water signs have an unparalleled emotional depth. "They are highly sensitive, nurturing, and incredibly resilient," she wrote.

Or, take victim to seek medical evaluation at Stanford Hospital Emergency Room. If possible, provide continuous irrigation during transport.