A Quote by Joseph Black
Heat may be considered, either in respect of its quantity, or of its intensity. Thus two lbs. of water, equally heated, must contain double the quantity that one of them does, though the thermometer applied to them separately, or together, stands at precisely the same point, because it requires double the time to heat two lbs. as it does to heat one.
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In all cases where work is produced by heat, a quantity of heat proportional to the work done is expended; and inversely, by the expenditure of a like quantity of work, the same amount of heat may be produced.
What I have related is sufficient for establishing the main principle, namely, that the heat which disappears in the conversion of water into vapour, is not lost, but is retained in vapour, and indicated by its expansive form, although it does not affect the thermometer. This heat emerges again from this vapour when it becomes water, and recovers its former quality of affecting the thermometer; in short, it appears again as the cause of heat and expansion.
What signifies Philosophy that does not apply to some Use? May we not learn from hence, that black Clothes are not so fit to wear in a hot Sunny Climate or Season, as white ones; because in such Cloaths the Body is more heated by the Sun when we walk abroad, and are at the same time heated by the Exercise, which double Heat is apt to bring on putrid dangerous Fevers? The Soldiers and Seamen, who must march and labour in the Sun, should in the East or West Indies have an Uniform of white?
What appeared to the earlier physicists to be the constant quantity of heat is nothing more than the whole motive power of the motion of heat, which remains constant so long as it is not transformed into other forms of work, or results afresh from them.
I am a leader. Leaders always get heat. They're always going against the grain. Jimi Hendrix got heat; Bob Marley got heat; Miles Davis got heat. Every great artist got heat. Heat means you're doing something right.
I am a leader, so leaders always get heat. They're always going against the grain. Jimi Hendrix got heat; Bob Marley got heat; Miles Davis got heat. Every great artist got heat. Heat means you're doing something right.
Don't speak if you don't have to about trivia. The time for joking comes because of the trust, and you have to earn the trust. So, I don't alibi for anything, and I'll take the heat. That's the other thing. Don't let them take the heat. We take the heat.
I could never do a show, or be a personality like Howard Stern, where you take all that heat from critics. What he does, he does, but the critical heat would crucify me.
Knowledge comes, but wisdom lingers. It may not be difficult to store up in the mind a vast quantity of facts within a comparatively short time, but the ability to form judgments requires the severe discipline of hard work and the tempering heat of experience and maturity.
But we must also look at renewable heat technology. More combined heat and power schemes, putting waste heat to better use. More district heating schemes. And more electric air and ground-source heat pumps, drawing warmth from the outside world to heat the indoors. Better insulation, smarter homes, and more efficient heating can help us cut our energy demand.
The physiological combustion theory takes as its starting point the fundamental principle that the amount of heat that arises from the combustion of a given substance is an invariable quantity-i.e., one independent of the circumstances accompanying the combustion-from which it is more specifically concluded that the chemical effect of the combustible materials undergoes no quantitative change even as a result of the vital process, or that the living organism, with all its mysteries and marvels, is not capable of generating heat out of nothing.
I think all families have these secrets, and it's sometimes the strangest things that bring them out. That was part of my interest in the heatwave, in heat as a catalyst for uncovering truths. I was reading Alice in Wonderland to one of my kids recently, and I remembered that it starts on a really hot day. Alice falls asleep because of the heat; the whole story is predicated on falling into a heat-fueled dream.
(On the temperature of water in wells) The reason why the water in wells becomes colder in summer is that the earth is then rarefied by the heat, and releases into the air all the heat-particles it happens to have. So, the more the earth is drained of heat, the colder becomes the moisture that is concealed in the ground. On the other hand, when all the earth condenses and contracts and congeals with the cold, then, of course, as it contracts, it squeezes out into the wells whatever heat it holds.
The hypothesis of molecular vortices is defined to be that which assumes - that each atom of matter consists of a nucleus or central point enveloped by an elastic atmosphere, which is retained in its position by attractive forces, and that the elasticity due to heat arises from the centrifugal force of those atmospheres revolving or oscillating about their nuclei or central points.According to this hypothesis, quantity of heat is the vis viva of the molecular revolutions or oscillations.
One cool judgment is worth a thousand hasty councils. The thing to do is to supply light and not heat. Ay any rate, if it is heat it ought to be white heat and not sputter, because sputtering heat is apt to spread the fire. There ought, if there is any heat at all, to be that warmth of the heart which makes every man thrust aside his own personal feeling, his own personal interest, and take thought of the welfare and benefit of others.
The hardest metal yields to sufficient heat. Even so must the hardest heart melt before sufficiency of the heat of non- violence. And there is no limit to the capacity of non-violence to generate heat.
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