With the introduction of Albert Einstein’s relativity theory in 1905, however, the notion of mass underwent a radical revision. In other words, processes that change the physical or chemical properties of substances (such as conversion of a liquid to a gas) leave the total mass unchanged. The law of conservation of mass implies that matter can be neither created nor destroyed. The greater the mass of an object, the smaller the change produced by an applied force. Mass is related to inertia, or the resistance of a body to a change in motion. Thus, as a satellite moves away from Earth’s gravitational pull, its weight decreases, but its mass stays the same. The mass of an object remains constant, but its weight varies from place to place according to the strength of gravity. Although the terms mass and weight are often used interchangeably, in science the terms have quite different meanings. The standard unit of measurement for mass is the kilogram. That change having occurred, Christ is offered anew to God the Father, and the church unites with him in that offering.In physics, mass refers to the amount of matter in an object. In the eucharistic prayer, the church asks God the Father to send the Holy Spirit upon the bread and wine on the altar so that by his power they may become the very body and blood that Christ offered on the cross ( see transubstantiation). The church also recalls the origin of the Eucharist in the Last Supper, when Jesus, anticipating his imminent death, offered his disciples bread and wine, saying, “Take this, all of you, and eat of it, for this is my body, which will be given up for you,” and, “Take this, all of you, and drink from it, for this is the chalice of my blood,…which will be poured out for you.” Jesus instructed the disciples to perpetuate this banquet in his memory.Īccording to church teaching, Christ’s sacrifice is not only recalled in the mass, it is made present. In the eucharistic prayer, the church commemorates Jesus Christ and his redeeming work, especially his sacrifice for the sake of all humankind through his crucifixion. The mass is at once a memorial and a sacrifice. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.
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