However, as petrol and diesel engines are also improving, the relationships between the different types of vehicles are not constant.
The theory explained that space is relative and not constant, and the only thing that is constant is the velocity of light.
Big Ben can deal with some pressure, but not constant pressure.
It was maybe because of Berne - where clocks continue to tick over centuries - that the Theory of Relativity, a concept that time is not constant, could have been born.
He has written a book suggesting that the speed of light is not constant, but was faster near the moment of the big bang with which most cosmologists believe the universe started.
War among the great powers was a common, if not constant, occurrence in the long periods of multipolarity from the 16th to the 18th centuries, culminating in the series of enormously destructive Europe-wide wars that followed the French Revolution and ended with Napoleon's defeat in 1815.
Mr Robson said Mr Griffiths was being assessed in a secure cell in the prison's hospital accommodation, but was not on constant watch.
Mr. HOGAN: The cheap dollar is part of the process, but it's not always to be blamed because there's not a constant relationship.
In some parts of Africa, such as the highlands of eastern Africa, the Sahel and the deserts of southern Africa, malaria is not a constant threat, but comes in sudden epidemics.
But economic growth is not a constant.
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In conclusion, it seems a number of conservatives and conservative or business-oriented newspapers or magazines are so relieved that a liberal moderator did not show constant and blatant bias, that they sigh with relief and give him a pass on the more muted or subtle forms of it.
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That has to be part of this conversation, not just this constant argument about cutting and spending.
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Another reason why apps have proved popular is that, unlike websites, they do not need a constant connection to the internet.
This is a fantastically challenging piece, requiring not only a constant sharp focus on the technical demands, but also a refined flexibility of tone and timbre.
Not only were constant chat-spam messages flooding almost all chat channels (General Chat, Trade Chat, and L4G), they were absolutely massive, spanning over many line breaks.
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Subjected not just to constant scrutiny but to deeply personal poking and twitching, the company and its two-legged resources themselves became a study: Of how a menacing axis of animal-rights zealots can nearly starve an enterprise they aim to ruin.
General Electric would be nowhere in quality control if not for quick and constant measurement of output.
"The question of violence is a constant concern not only for the World Cup, but for other big events, " he said.
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The central tendency of computer models using input that pretty much mimics the observed changes in carbon dioxide is to produce a constant (not an increasing) rate of warming.
Because the energy flow is not just non-constant but also erratic, the back-up systems also need to be extremely sensitive and capable of ramping up from shut-down to fully-on within a very short period of time to prevent grid instability and even collapse.
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Not having to sweat a constant onslaught of new competitors is really underrated.
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But we hasten to warn taxpayers that the new rules do not eliminate the need for constant vigilance in tax planning.
The players are not being paid and need constant motivation and mentoring.
No, Constant Contact is not the best e-mail marketing service around.
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Half those interviewed in a poll published this week said they would like to leave, many saying they could not live any more with constant fear.
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Since then, the BBC has found itself under almost constant fire, not least in the newspapers which now compete with it, as they extend their businesses onto the internet.
We need our video game worlds to be constant and endless, not thrown out in eight hour chunks every two years.
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Peterson and his partner had to invest in expensive shade cloth to protect their yield, not to mention the costs of constant irrigation.
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