Temperature symbol and unit

To sign "Temperature" in American Sign Language (ASL), take your dominant hand with an open palm and fingers together, pointing downwards, and use your pinky finger to trace along the extended index finger of your non-dominant hand from the top to the bottom.

To sign "Temperature" in American Sign Language (ASL), using the pinky finger of your dominant hand, which has an open palm with fingers together and facing downward, trace from the top to the bottom of the extended index finger of your non-dominant hand.

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Hydrofluoric Acid (HF) is one of the most hazardous chemicals at used Cornell. Small exposures to HF can be fatal if not treated properly. The critical minutes immediately after an exposure can have a great effect on the chances of a victim’s survival.

Degree symbol

Prior approval - Before anyone uses HF they must have prior approval from the Principal investigator and cannot begin until the following is completed:

HF is a gas that is dissolved in water to form Hydrofluoric acid. The concentration can vary from very low such as in store bought products up to the most concentrated 70% form (anhydrous), with the most common lab use around 48%. The liquid is colorless, non-flammable and has a pungent odor. The OSHA permissible exposure limit is 3 ppm, but concentrations should be kept as low as possible. HF is actually a weak acid by definition and not as corrosive as strong acids such as Hydrochloric (HCl), however, corrosivity is the least hazardous aspect of HF. The toxicity of HF is the main concern.

Additional information on the safe use and handling of Hydrofluoric acid (HF) can be found on the Honeywell website - the world's largest producer of Hydrofluoric Acid. This website contains useful information on HF such as:

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HF is absorbed through the skin quickly and is a severe systemic toxin. The fluoride ion binds calcium in the blood, bones and other organs and causes damage to tissues that is very painful and can be lethal. At the emergency room, the victim is often given calcium injections, but pain medication is not generally given since the pain subsiding is the only indication that the calcium injections are working.

To sign "Temperature" in American Sign Language (ASL), using the pinky finger of your dominant hand, which has an open palm with fingers together and facing downward, trace from the top to the bottom of the extended index finger of your non-dominant hand.