Yes, older people, even when healthy, often have lower body temperatures than young adults. This is due to a slower metabolism and less efficient regulation of body temperature in older age.
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Heat is the total energy of all particles in a substance, while temperature is the average kinetic energy of those particles. Heat depends on mass, while temperature does not.
Radiation is the transfer of heat through electromagnetic waves. It doesn’t require a medium, meaning heat can travel through a vacuum, like from the Sun to Earth.
Heat transfer occurs through conduction, convection, and radiation. These processes involve the movement of thermal energy from a hotter area to a cooler one.
The boiling point of water is 100°C or 212°F at standard atmospheric pressure. It is used as a reference point in temperature scales and calibrating thermometers.