What does Btu (IT) inch/second/sq. foot/°F measure?

It measures the heat flow in British thermal units (International Table) per second through a material of one inch thickness and one square foot area with a temperature difference of one degree Fahrenheit.

When should I use Btu (th) inch/hour/sq. foot/°F?

This unit is used to quantify heat flow in thermochemical British thermal units transmitted per hour through building materials, commonly applied in US customary engineering contexts.

Why is there a large conversion factor between these units?

Because Btu (IT) uses the International Table definition and measures per second, while Btu (th) uses the thermochemical definition and measures per hour, resulting in a large scale factor.

How to Convert from Btu (IT) inch/second/sq. foot/°F to Btu (th) inch/hour/sq. foot/°F?

Learn to convert thermal conductivity values from Btu (International Table) inch per second per square foot per degree Fahrenheit to Btu (thermochemical) inch per hour per square foot per degree Fahrenheit for accurate heat transfer analysis in building science and HVAC applications.

Btu (IT) inch/second/sq. foot/°F

Btu (th) inch/hour/sq. foot/°F

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Btu (IT) inch/second/sq. foot/°F to Btu (th) inch/hour/sq. foot/°F Conversion Table

Btu (IT) inch/second/sq. foot/°F	Btu (th) inch/hour/sq. foot/°F

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Btu (IT) inch/second/sq. foot/°F to Btu (th) inch/hour/sq. foot/°F Conversion Table
Btu (IT) inch/second/sq. foot/°F	Btu (th) inch/hour/sq. foot/°F

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What Is This Tool?

This converter changes thermal conductivity measurements from Btu (IT) inch/second/square foot/°F to Btu (th) inch/hour/square foot/°F, facilitating accurate translation between different British thermal unit conventions used in US customary engineering and building material analysis.

How to Use This Tool?

Enter the value in Btu (IT) inch/second/sq. foot/°F.
Select the units to convert from and to.
Click convert to get the equivalent value in Btu (th) inch/hour/sq. foot/°F.

Key Features

Converts thermal conductivity values between two specific Btu-based units.
Supports engineering calculations in HVAC and building envelope performance.
Enables conversion of material property tables for insulation and construction materials.

Examples

0.5 Btu (IT) inch/second/sq. foot/°F converts to approximately 1801.20 Btu (th) inch/hour/sq. foot/°F.
2 Btu (IT) inch/second/sq. foot/°F converts to approximately 7204.82 Btu (th) inch/hour/sq. foot/°F.

Common Use Cases

Specifying thermal conductivity for building insulation and construction materials using US customary units.
Performing heat transfer calculations for HVAC system design and building energy modeling.
Converting thermal conductivity data for engineering analysis involving different Btu unit definitions.

Tips & Best Practices

Ensure correct selection of original and target units when performing conversions.
Use this tool for materials measured through a thickness of one inch and an area of one square foot.
Handle large scale factors carefully to maintain numerical accuracy.

Limitations

The conversion factor differs due to the distinct bases of Btu International Table and thermochemical units.
Applicable only to thermal conductivity assuming one-inch thickness and one square foot area with a one °F temperature difference.
Large numerical scale requires caution to avoid calculation errors.

Frequently Asked Questions

What does Btu (IT) inch/second/sq. foot/°F measure?: It measures the heat flow in British thermal units (International Table) per second through a material of one inch thickness and one square foot area with a temperature difference of one degree Fahrenheit.
When should I use Btu (th) inch/hour/sq. foot/°F?: This unit is used to quantify heat flow in thermochemical British thermal units transmitted per hour through building materials, commonly applied in US customary engineering contexts.
Why is there a large conversion factor between these units?: Because Btu (IT) uses the International Table definition and measures per second, while Btu (th) uses the thermochemical definition and measures per hour, resulting in a large scale factor.

Key Terminology

Btu (IT) inch/second/sq. foot/°F: A thermal conductivity unit using heat flow in Btu (International Table) per second through one inch thickness and one square foot area for a one degree Fahrenheit temperature difference.
Btu (th) inch/hour/sq. foot/°F: A thermal conductivity unit expressing heat flow in thermochemical Btu per hour through a material one inch thick and one square foot in area for a one degree Fahrenheit temperature difference.
Thermal Conductivity: A material property that measures how easily heat passes through a solid, depending on thickness, area, and temperature gradient.

Quick Knowledge Check

What is the primary use of converting Btu (IT) inch/second/sq. foot/°F to Btu (th) inch/hour/sq. foot/°F?

To measure electrical conductivity

To translate thermal conductivity between different British thermal unit conventions

To convert temperature units

Which parameter does this conversion assume constant in the material?

Thickness of one inch

Area of one square meter

Temperature difference of one degree Celsius

What unit does Btu (th) represent in this conversion?

International Table British thermal unit

Thermochemical British thermal unit

SI unit of heat

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