Helium: It is an inert gas that is lighter than air. It is non-flammable.

1 volt = 1 joule / 1 coulomb

This equation represents the definition of voltage (in volts). It states that one volt is equal to one joule of energy per one coulomb of charge. Voltage measures the electric potential difference between two points and is a fundamental concept in electrical physics.

A pacemaker is a medical device used to regulate the heartbeat in individuals with abnormal heart rhythms (arrhythmias). It is often implanted in the chest to help control the heart's rhythm and treat conditions like bradycardia (slow heart rate) or other rhythm disorders. Pacemakers are typically prescribed by cardiologists, specialized doctors who diagnose and treat heart-related conditions. The decision to implant a pacemaker is made by a healthcare provider based on the patient's specific medical condition and needs.

An Admiral of the fleet is a military naval officer of the highest rank. In many nations, the rank is reserved for wartime of ceremonial appointments. It is usually a rank above admiral (which is now usually the highest rank in peace-time for officers in active service) and is often held by the most senior admiral of an entire naval sevice.

the uppermost layer of the skin is called the epidermis. It is the outermost layer of the skin and provides a protective barrier against environmental factors, pathogens, and moisture loss. The epidermis also contains cells responsible for producing melanin, the pigment that gives skin its color, and it constantly renews itself through a process called cell turnover.