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What is the difference between data verification and data validation?

Data verification is a way of ensuring the user types in what he or she intends, in other words, to make sure the user does not make a mistake when inputting data. An example of this includes double entry of...
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Answered by Cesar F. • Computing tutor
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1 dm^3 of water steam at 200 degrees C, 10 bar enters a compressor. When it leaves, its temperature is 400 deg. C and volume 0.5 dm^3. Calculate the final pressure of steam. Critically discuss the assumptions you made in your calculations.

This question refers to the behavior of gases under compression. In IB we model such situations using the ideal gas equation, which states that: pV = nRT, where: p - pressure of the gas V – its volume n – nu...
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Answered by Marcin M. • Physics tutor
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Sort the following substances MgO, Na, H2O, H2S, NaCl, in the order of increasing melting temperature.

This question deals with the properties of substances and how they relate to their internal structure. First, we of course need to understand what the property we are asked to evaluate means. Melting tempera...
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Answered by Marcin M. • Chemistry tutor
15818 Views

In a lottery, 6 numbered balls are drawn from a pool of 59. Calculate the probability of scoring a jackpot. There used to be 49 balls in the pool. Calculate by how much the addition of 10 balls has decreased the probability of scoring a jackpot

The question has to do with probability, and the branch of mathematics which models such situations is called probability theory. A jackpot is, of course, when we correctly predict all the numbers on the bal...
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Answered by Marcin M. • Maths tutor
13368 Views

Explain how a nerve impulse passes along a non-myelinated neuron

Nerve impulses are electrical impulses that travel along the axons of nerve cells (neurons) carrying various information. Propagation of electricity is possible due to differences in electrical potential bet...
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Answered by Paula S. • Biology tutor
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