Diseases, Conditions, Syndromes

Spain revises virus death toll down by nearly 2,000

Spain's government on Monday revised downward the country's death toll from the coronavirus by nearly 2,000, bringing the total number of deaths recorded to 26,834.

Diseases, Conditions, Syndromes

Have a reusable face mask? Here's how to wash it the right way

Since the Centers for Disease Control and Prevention has recommended cloth face coverings for the general public, many have relied on those while reserving medical masks, such as N95 respirators, for medical workers.

Diseases, Conditions, Syndromes

Heating could be the best way to disinfect N95 masks for reuse

Since the outbreak of the COVID-19 pandemic, N95 face masks have been in short supply. Health care workers, in particular, desperately need these masks to protect themselves from the respiratory droplets of infected patients. ...

Diseases, Conditions, Syndromes

Researchers look at dry heat to curb depletion of N95 respirator masks

As the COVID-19 pandemic spreads and nears its so-called apex in New York State, the need for N95 respirator masks, which protect against inhalation of airborne coronavirus molecular particles, is still a top concern. According ...

Health

Milk production declines due to heat stress in Northern China

Northern China is a major dairy-producing region. However, milk production is expected to decline drastically by 2050, with losses potentially up to 50% by 2070, because of heat stress in July, according to a new study.

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Heat

In physics and thermodynamics, heat is the process of energy transfer from one body or system to another due to a difference in temperature. In thermodynamics, the quantity TdS is used as a representative measure of the (inexact) heat differential δQ, which is the absolute temperature of an object multiplied by the differential quantity of a system's entropy measured at the boundary of the object.

A related term is thermal energy, loosely defined as the energy of a body that increases with its temperature. Heat is also loosely referred to as thermal energy, although many definitions require this thermal energy to actually be in the process of movement between one body and another to be technically called heat (otherwise, many sources prefer to continue to refer to the static quantity as "thermal energy"). Heat is also known as "Energy".

Energy transfer by heat can occur between objects by radiation, conduction and convection. Temperature is used as a measure of the internal energy or enthalpy, that is the level of elementary motion giving rise to heat transfer. Energy can only be transferred by heat between objects - or areas within an object - with different temperatures (as given by the zeroth law of thermodynamics). This transfer happens spontaneously only in the direction of the colder body (as per the second law of thermodynamics). The transfer of energy by heat from one object to another object with an equal or higher temperature can happen only with the aid of a heat pump, which does work.

This text uses material from Wikipedia, licensed under CC BY-SA