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Across 1. A coherent, typically large body of matter with no definite shape. 4. A set of connected things or parts forming a complex whole, in particular. 9. One trillionth. 11. The action or process of calibrating an instrument or experimental readings. 12. The quality of being hot; high temperature. 13. Of or denoting a scale of temperature on which water freezes at 32° and boils at 212° under standard conditions. 14. The fundamental unit of length in the metric system, equal to 100 centimeters or approximately 39.37 inches. 16. The degree of compactness of a substance. 18. Analysis using the fact that physical quantities added to or equated with each other must be expressed in terms of the same fundamental quantities (such as mass, length, or time) for inferences to be made about the relations between them. 19. 1000x. 21. Of or denoting a scale of temperature on which water freezes at 0° and boils at 100° under standard conditions. 22. An apparatus for measuring the amount of heat involved in a chemical reaction or other process. 24. Relating to, measuring, or measured by the quantity of something rather than its quality. 26. The amount of space that a substance or object occupies, or that is enclosed within a container, esp. when great. 27. Matter and energy may not cross the boundary. 29. A measurement system used worldwide in the scientific community. SI stands for Système International. 30. Refinement in a measurement, calculation, or specification, esp. as represented by the number of digits given. 31. The degree or intensity of heat present in a substance or object, esp. as expressed according to a comparative scale and shown by a thermometer or perceived by touch. 32. A metric unit of mass equal to one thousandth of a kilogram. 33. (of a reaction or process) Accompanied by the release of heat.

Down 2. The degree to which the result of a measurement, calculation, or specification conforms to the correct value or a standard 3. A metric unit of capacity, formerly defined as the volume of 1 kilogram of water under standard conditions, now equal to 1,000 cubic centimeters. 4. The things and conditions around a person or thing. 5. Many, if not most, parameters and measurements in the physical sciences and engineering are expressed as a numerical quantity and a corresponding dimensional unit. 6. One of a set of unrelated units of measurement, which are arbitrarily defined and from which other units are derived. 7. Each of the digits of a number that are used to express it to the required degree of accuracy, starting from the first nonzero digit. 8. The heat required to raise the temperature of the unit mass of a given substance by a given amount. 10. Scientific notation, also known as standard form or as exponential notation, is a way of writing numbers that accommodates values too large or small to be conveniently written in standard decimal notation. 15. Not directly caused by or resulting from something 17. The International System of Units (SI) specifies a set of seven base units from which all other units of measurement are formed. 20. Relating to, measuring, or measured by the quality of something rather than its quantity. 23. Accompanied by or requiring the absorption of heat 25. The SI base unit of thermodynamic temperature, equal in magnitude to the degree Celsius. 28. (of evidence or proof) Bearing immediately and unambiguously upon the facts at issue.