Primary causes are unknown to us; but are subject to simple and constant laws, which may be discovered by observation, the study of them being the object of natural philosophy. Heat, like gravity, penetrates every substance of the universe, its rays occupy all parts of space. The object of our work is to set forth the mathematical laws which this element obeys. The theory of heat will hereafter form one of the most important branches of general physics.
Joseph FourierRelated topics
constant element form forth general heat natural primary set simple space study unknown work Laws partsRelated quotes
Second Theory.-Whilst one part of the Universe owes its existence to Providence and is under control of a ruler and governor, another part is abandoned and left to chance. This is the view of Aristotle about Providence... He holds that God controls the spheres and what they contain; therefore the individual beings in the spheres remain permanently in the same form. ...From the existence of the spheres other beings derive existence, which are constant in their species but not in their individuals.
Maimonides
It is a question of going beyond the description of mechanisms of interaction between locations and activities, in order to discover the structural laws of the production and functioning of the spatial forms studied... There is no specific theory of space, but quite simply a deployment and specification of the theory of social structure, in order to account for the characteristics of the particular social form, space and its articulation with other historically given, form and processes.
Manuel Castells
By symmetry we mean the existence of different viewpoints from which the system appears the same. It is only slightly overstating the case to say that physics is the study of symmetry. The first demonstration of the power of this idea may have been by Newton, who may have asked himself the question: What if the matter here in my hand obeys the same laws as that up in the sky-that is, what if space and matter are homogeneous and isotropic?
Philip Warren Anderson
In quantum physics, however, each observation implies an intervention in the observed. Because of the quantum physical laws of nature, a change of state of the observed is inevitably coupled to the observation process. So it's not a situation independent from the experiment that is observed, but we ourselves call forth the facts (or compel them to go in a certain direction to a disambiguation), that then become an observation.
Pascual Jordan
The most powerful influence exercised by the Arabs on general natural physics was that directed to the advances of chemistry; a science for which this race created a new era.(...) Besides making laudatory mention of that which we owe to the natural science of the Arabs in both the terrestrial and celestial spheres, we must likewise allude to their contributions in separate paths of intellectual development to the general mass of mathematical science.
Alexander von Humboldt